📖 ULCS Isotope Atlas — Master File

Scope: All known isotopes of the 118 elements mapped into the Unified Logos Codex System (ULCS), including etymology, stability, and symbolic resonance.
Coverage: Batches 1–13 (H → Og).

A complete mapping of all isotopes of the elements (H → Og) with integration to the Universal Linguistic Coordinating System (ULCS). Each isotope is presented with its nuclear stability, half-life, ULCS symbolic association, and etymology.


Batch 1 — Hydrogen to Beryllium

¹H (Protium) → Stable | ULCS: Unity | Etymology: Greek hydro “water” + genes “forming.”

²H (Deuterium, D) → Stable | ULCS: Duality | Etymology: Greek deuteros “second.”

³H (Tritium, T) → Radioactive (12.32 y) | ULCS: Trinity | Etymology: Greek tritos “third.”

³He → Stable | ULCS: Dual Helix | Etymology: Greek helios “sun.”

⁴He → Stable | ULCS: Foundation | Etymology: Greek helios “sun.”

⁶Li → Stable | ULCS: Balance | Etymology: Greek lithos “stone.”

⁷Li → Stable | ULCS: Completion | Etymology: Greek lithos “stone.”

⁹Be → Stable | ULCS: Transparency | Etymology: Greek beryllos “precious stone (beryl).”


Batch 2 — Boron to Neon

¹⁰B → Stable | ULCS: Harmony | Etymology: Arabic buraq “borax.”

¹¹B → Stable | ULCS: Resonance | Etymology: Arabic buraq.

¹²C → Stable | ULCS: Structure | Etymology: Latin carbo “coal.”

¹³C → Stable | ULCS: Trace | Etymology: Latin carbo.

¹⁴C → Radioactive (5730 y) | ULCS: Decay-Measure | Etymology: Latin carbo.

¹⁴N → Stable | ULCS: Cycle | Etymology: Latin nitrum “niter.”

¹⁵N → Stable | ULCS: Mirror | Etymology: Latin nitrum.

¹⁶O → Stable | ULCS: Life | Etymology: Greek oxys “acid, sharp.”

¹⁷O → Stable | ULCS: Variation | Etymology: Greek oxys.

¹⁸O → Stable | ULCS: Expansion | Etymology: Greek oxys.

¹⁹F → Stable | ULCS: Purity | Etymology: Latin fluere “to flow.”

²⁰Ne → Stable | ULCS: Noble Foundation | Etymology: Greek neos “new.”

²¹Ne → Stable | ULCS: Variant | Etymology: Greek neos.

²²Ne → Stable | ULCS: Balance | Etymology: Greek neos.


Batch 3 — Sodium to Argon

²³Na → Stable | ULCS: Flow | Etymology: Arabic natrun “natron.”

²⁴Mg → Stable | ULCS: Strength | Etymology: Magnesia (Greek region).

²⁵Mg → Stable | ULCS: Variant Strength | Etymology: Magnesia.

²⁶Mg → Stable | ULCS: Endurance | Etymology: Magnesia.

²⁷Al → Stable | ULCS: Framework | Etymology: Latin alumen “alum.”

²⁸Si → Stable | ULCS: Foundation | Etymology: Latin silex “flint.”

²⁹Si → Stable | ULCS: Adaptation | Etymology: Latin silex.

³⁰Si → Stable | ULCS: Expansion | Etymology: Latin silex.

³¹P → Stable | ULCS: Energy Carrier | Etymology: Greek phōs-phoros “light-bearer.”

³²S → Stable | ULCS: Cycles | Etymology: Latin sulphur.

³³S → Stable | ULCS: Resonance | Etymology: Latin sulphur.

³⁴S → Stable | ULCS: Abundance | Etymology: Latin sulphur.

³⁶S → Stable | ULCS: Rare Balance | Etymology: Latin sulphur.

³⁵Cl → Stable | ULCS: Penetration | Etymology: Greek chloros “green.”

³⁷Cl → Stable | ULCS: Protection | Etymology: Greek chloros.

³⁶Ar → Stable | ULCS: Quiet | Etymology: Greek argos “inactive.”

³⁸Ar → Stable | ULCS: Balance | Etymology: Greek argos.

⁴⁰Ar → Stable | ULCS: Dominant Presence | Etymology: Greek argos.


Batch 4 — Potassium to Krypton

³⁹K → Stable | ULCS: Vitality | Etymology: Arabic al-qalyah “alkali.”

⁴⁰K → Radioactive (1.25B y) | ULCS: Temporal Marker | Etymology: Arabic al-qalyah.

⁴¹K → Stable | ULCS: Steadiness | Etymology: Arabic al-qalyah.

⁴⁰Ca → Stable | ULCS: Foundation | Etymology: Latin calx “lime.”

⁴²Ca, ⁴³Ca, ⁴⁴Ca, ⁴⁶Ca, ⁴⁸Ca → Stable | ULCS: Variants of Stability | Etymology: Latin calx.

⁴⁵Sc → Stable | ULCS: Transition | Etymology: Scandinavia.

⁵⁰Ti → Stable | ULCS: Strength | Etymology: Titans (Greek mythology).

⁴⁶Ti, ⁴⁷Ti, ⁴⁸Ti, ⁴⁹Ti → Stable | ULCS: Variants | Etymology: Titans.

⁵¹V → Stable | ULCS: Adaptability | Etymology: Norse goddess Vanadis.

⁵²Cr → Stable | ULCS: Color | Etymology: Greek chroma “color.”

⁵³Cr → Stable | ULCS: Balance | Etymology: Greek chroma.

⁵⁴Cr → Stable | ULCS: Diversity | Etymology: Greek chroma.

⁵⁵Mn → Stable | ULCS: Catalyst | Etymology: Latin magnes “magnet.”

⁵⁶Fe → Stable | ULCS: Strength | Etymology: Latin ferrum “iron.”

⁵⁴Fe, ⁵⁷Fe, ⁵⁸Fe → Stable | ULCS: Variants | Etymology: Latin ferrum.

⁵⁹Co → Stable | ULCS: Magnetism | Etymology: German kobold “goblin.”

⁶⁰Ni → Stable | ULCS: Transition | Etymology: German kupfernickel “false copper.”

⁵⁸Ni, ⁶¹Ni, ⁶²Ni, ⁶⁴Ni → Stable | ULCS: Variants | Etymology: German kupfernickel.

⁶³Cu → Stable | ULCS: Conduction | Etymology: Latin cuprum “from Cyprus.”

⁶⁵Cu → Stable | ULCS: Exchange | Etymology: Latin cuprum.

⁶⁴Zn → Stable | ULCS: Shield | Etymology: German zinke “prong.”

⁶⁶Zn, ⁶⁷Zn, ⁶⁸Zn, ⁷⁰Zn → Stable | ULCS: Variants | Etymology: German zinke.

⁶⁹Ga, ⁷¹Ga → Stable | ULCS: Semiconductors | Etymology: Latin Gallia “France.”

⁷⁰Ge, ⁷²Ge, ⁷³Ge, ⁷⁴Ge, ⁷⁶Ge → Stable | ULCS: Metalloid Harmony | Etymology: Latin Germania “Germany.”

⁷⁵As → Stable | ULCS: Dual Nature | Etymology: Greek arsenikon “potent.”

⁷⁶Se, ⁷⁷Se, ⁷⁸Se, ⁸⁰Se, ⁸²Se → Stable | ULCS: Selenium Bridge | Etymology: Greek selēnē “moon.”

⁷⁹Br, ⁸¹Br → Stable | ULCS: Liquid Transition | Etymology: Greek bromos “stench.”

⁷⁸Kr, ⁸⁰Kr, ⁸²Kr, ⁸³Kr, ⁸⁴Kr, ⁸⁶Kr → Stable | ULCS: Noble Quietude | Etymology: Greek kryptos “hidden.”


Batch 5 — Rubidium to Xenon

Rubidium (Rb, Z=37)

  • ⁸⁵Rb → Stable | ULCS: Resonant Stability | Etymology: Latin rubidus “deep red.”
  • ⁸⁷Rb → Radioactive (4.9×10¹⁰ y) | ULCS: Temporal Clock | Etymology: Latin rubidus.

Strontium (Sr, Z=38)

  • ⁸⁴Sr → Stable | ULCS: Rare Balance | Etymology: Strontian, Scotland.
  • ⁸⁶Sr → Stable | ULCS: Structural Variant | Etymology: Strontian.
  • ⁸⁷Sr → Stable | ULCS: Geological Marker | Etymology: Strontian.
  • ⁸⁸Sr → Stable | ULCS: Dominant Balance | Etymology: Strontian.
  • ⁹⁰Sr → Radioactive (28.8 y, fission product) | ULCS: Contaminant Resonance | Etymology: Strontian.

Yttrium (Y, Z=39)

  • ⁸⁹Y → Stable | ULCS: Harmonic Anchor | Etymology: Ytterby, Sweden.
  • ⁹⁰Y → Radioactive (64 h) | ULCS: Transient Pulse | Etymology: Ytterby.

Zirconium (Zr, Z=40)

  • ⁹⁰Zr → Stable | ULCS: Foundation | Etymology: Persian zargun “gold-colored.”
  • ⁹¹Zr → Stable | ULCS: Strength Variant | Etymology: Persian zargun.
  • ⁹²Zr → Stable | ULCS: Resonance Variant | Etymology: Persian zargun.
  • ⁹⁴Zr → Stable | ULCS: Balance | Etymology: Persian zargun.
  • ⁹⁶Zr → Radioactive (3.5×10¹⁹ y, nearly stable) | ULCS: Eternal Decay | Etymology: Persian zargun.

Niobium (Nb, Z=41)

  • ⁹³Nb → Stable | ULCS: Transition Bridge | Etymology: Niobe (Greek mythology).

Molybdenum (Mo, Z=42)

  • ⁹²Mo → Stable | ULCS: Base Catalyst | Etymology: Greek molybdos “lead.”
  • ⁹⁴Mo → Stable | ULCS: Harmony | Etymology: Greek molybdos.
  • ⁹⁵Mo → Stable | ULCS: Industrial Resonance | Etymology: Greek molybdos.
  • ⁹⁶Mo → Stable | ULCS: Reactor Balance | Etymology: Greek molybdos.
  • ⁹⁷Mo → Stable | ULCS: Rare Strength | Etymology: Greek molybdos.
  • ⁹⁸Mo → Stable | ULCS: Abundance Catalyst | Etymology: Greek molybdos.
  • ¹⁰⁰Mo → Radioactive (double beta decay, 7.8×10¹⁸ y) | ULCS: Silent Decay | Etymology: Greek molybdos.

Technetium (Tc, Z=43)

  • No stable isotopes.
  • ⁹⁸Tc, ⁹⁹Tc → Radioactive (⁹⁹Tc: 2.1×10⁵ y) | ULCS: Artificial Marker | Etymology: Greek technetos “artificial.”
  • ⁹⁹ᵐTc → Metastable, 6 h, key medical tracer | ULCS: Healing Pulse | Etymology: Greek technetos.

Ruthenium (Ru, Z=44)

  • ⁹⁶Ru, ⁹⁸Ru, ⁹⁹Ru, ¹⁰⁰Ru, ¹⁰¹Ru, ¹⁰²Ru, ¹⁰⁴Ru → Stable | ULCS: Noble Resonance | Etymology: Latin Ruthenia “Russia.”

Rhodium (Rh, Z=45)

  • ¹⁰³Rh → Stable | ULCS: Pure Reflection | Etymology: Greek rhodon “rose.”

Palladium (Pd, Z=46)

  • ¹⁰²Pd, ¹⁰⁴Pd, ¹⁰⁵Pd, ¹⁰⁶Pd, ¹⁰⁸Pd, ¹¹⁰Pd → Stable | ULCS: Absorber Shield | Etymology: Greek Pallas (asteroid).

Silver (Ag, Z=47)

  • ¹⁰⁷Ag, ¹⁰⁹Ag → Stable | ULCS: Conductive Bridge | Etymology: Latin argentum “shining.”

Cadmium (Cd, Z=48)

  • ¹⁰⁶Cd, ¹⁰⁸Cd, ¹¹⁰Cd, ¹¹¹Cd, ¹¹²Cd, ¹¹³Cd, ¹¹⁴Cd, ¹¹⁶Cd → Stable (¹¹³Cd nearly stable) | ULCS: Reactor Absorber | Etymology: Greek kadmeia “calamine.”

Indium (In, Z=49)

  • ¹¹³In → Radioactive (4.3×10¹⁴ y, nearly stable) | ULCS: Timekeeper Trace | Etymology: Latin indicum “indigo.”
  • ¹¹⁵In → Stable | ULCS: Balance Line | Etymology: Latin indicum.

Tin (Sn, Z=50)

  • ¹¹²Sn, ¹¹⁴Sn, ¹¹⁵Sn, ¹¹⁶Sn, ¹¹⁷Sn, ¹¹⁸Sn, ¹¹⁹Sn, ¹²⁰Sn, ¹²²Sn, ¹²⁴Sn → Stable | ULCS: Versatile Metal | Etymology: Latin stannum.

Antimony (Sb, Z=51)

  • ¹²¹Sb, ¹²³Sb → Stable | ULCS: Dual Pathways | Etymology: Greek anti-monos “not alone.”

Tellurium (Te, Z=52)

  • ¹²⁰Te, ¹²²Te, ¹²³Te, ¹²⁴Te, ¹²⁵Te, ¹²⁶Te, ¹²⁸Te, ¹³⁰Te → Stable (some very long-lived radioactive) | ULCS: Semi-metal Resonance | Etymology: Latin tellus “earth.”

Iodine (I, Z=53)

  • ¹²⁷I → Stable | ULCS: Essential Node | Etymology: Greek ioeides “violet-colored.”
  • ¹³¹I → Radioactive (8 d, medical) | ULCS: Healing Decay | Etymology: Greek ioeides.

Xenon (Xe, Z=54)

  • ¹²⁴Xe, ¹²⁶Xe, ¹²⁸Xe, ¹²⁹Xe, ¹³⁰Xe, ¹³¹Xe, ¹³²Xe, ¹³⁴Xe, ¹³⁶Xe → Stable (¹²⁴Xe long-lived radioactive, 1.8×10²² y) | ULCS: Noble Stillness | Etymology: Greek xenos “stranger.”

Batch 6 — Cesium to Neodymium

Cesium (Cs, Z=55)

  • ¹³³Cs → Stable | ULCS: Primary clock glyph, resonance standard.
  • ¹³⁷Cs → Radioactive (30.2 y, fission product) | ULCS: Contaminant time pulse.
  • Etymology: Latin caesius “sky blue.”

Barium (Ba, Z=56)

  • ¹³⁰Ba, ¹³²Ba, ¹³⁴Ba, ¹³⁵Ba, ¹³⁶Ba, ¹³⁷Ba, ¹³⁸Ba → Stable (¹³⁰Ba nearly stable, t½ ≈ 10²¹ y) | ULCS: Reactive earth anchor.
  • Etymology: Greek barys “heavy.”

Lanthanum (La, Z=57)

  • ¹³⁹La → Stable | ULCS: Hidden starter glyph, initiator lexeme.
  • ¹³⁸La → Radioactive (1.05×10¹¹ y, primordial) | ULCS: Silent resonance.
  • Etymology: Greek lanthanein “to lie hidden.”

Cerium (Ce, Z=58)

  • ¹³⁶Ce, ¹³⁸Ce, ¹⁴⁰Ce, ¹⁴²Ce → Stable (¹³⁶Ce long-lived radioactive, 10¹⁰ y) | ULCS: Catalyst glyph, fire-spark morpheme.
  • Etymology: Named after asteroid Ceres.

Praseodymium (Pr, Z=59)

  • ¹⁴¹Pr → Stable | ULCS: Green twin glyph, rare-earth phoneme.
  • Etymology: Greek prasios didymos “green twin.”

Neodymium (Nd, Z=60)

  • ¹⁴²Nd, ¹⁴³Nd, ¹⁴⁵Nd, ¹⁴⁶Nd, ¹⁸⁸Nd → Stable (¹⁴⁴Nd radioactive, t½ ≈ 2.3×10¹⁵ y) | ULCS: Magnetic resonance word, spectrum morpheme.
  • Etymology: Greek neos didymos “new twin.”

Batch 7 — Promethium to Dysprosium

Promethium (Pm, Z=61)

  • All isotopes radioactive; no stable isotopes.
  • Longest-lived: ¹⁴⁵Pm (17.7 y), ¹⁴⁷Pm (2.62 y).
  • ULCS: Fire-bearer glyph, symbol of stolen light, unstable word.
  • Etymology: Prometheus, who stole fire for humanity.

Samarium (Sm, Z=62)

  • ¹⁴⁴Sm, ¹⁴⁷Sm, ¹⁴⁸Sm, ¹⁴⁹Sm, ¹⁵⁰Sm, ¹⁵²Sm, ¹⁵⁴Sm → Stable (¹⁴⁷Sm long-lived radioactive, 1.06×10¹¹ y).
  • ULCS: Neutron absorber glyph, spectrum stabilizer.
  • Etymology: Named after mineral samarskite (Colonel Samarsky).

Europium (Eu, Z=63)

  • ¹⁵¹Eu, ¹⁵³Eu → Stable.
  • ULCS: Bright resonance glyph, spectral lamp phoneme.
  • Etymology: Named after Europe.

Gadolinium (Gd, Z=64)

  • ¹⁵²Gd, ¹⁵⁴Gd, ¹⁵⁵Gd, ¹⁵⁶Gd, ¹⁵⁷Gd, ¹⁵⁸Gd, ¹⁶⁰Gd → Stable.
  • ULCS: Magnetic glyph, medical imaging resonance.
  • Etymology: Johan Gadolin, Finnish chemist.

Terbium (Tb, Z=65)

  • ¹⁵⁹Tb → Stable.
  • ULCS: Single-point glyph, sharp tonal resonance.
  • Etymology: Named after Ytterby, Sweden.

Dysprosium (Dy, Z=66)

  • ¹⁵⁶Dy, ¹⁵⁸Dy, ¹⁶⁰Dy, ¹⁶¹Dy, ¹⁶²Dy, ¹⁶³Dy, ¹⁶⁴Dy → Stable.
  • ULCS: Hard-to-approach glyph, magnetic resonance stabilizer.
  • Etymology: Greek dysprositos “hard to get at.”

Batch 8 — Holmium to Ytterbium

Holmium (Ho, Z=67)

  • ¹⁶⁵Ho → Stable.
  • ULCS: Central resonance glyph, hidden frequency pivot.
  • Etymology: From Holmia (Latin for Stockholm).

Erbium (Er, Z=68)

  • ¹⁶²Er, ¹⁶⁴Er, ¹⁶⁶Er, ¹⁶⁷Er, ¹⁶⁸Er, ¹⁷⁰Er → Stable.
  • ULCS: Optical amplifier glyph, pink spectral resonance.
  • Etymology: Named after Ytterby, Sweden.

Thulium (Tm, Z=69)

  • ¹⁶⁹Tm → Stable.
  • ULCS: Rare glyph, laser pulse marker.
  • Etymology: From Thule, mythical far-north land.

Ytterbium (Yb, Z=70)

  • ¹⁶⁸Yb, ¹⁷⁰Yb, ¹⁷¹Yb, ¹⁷²Yb, ¹⁷³Yb, ¹⁷⁴Yb, ¹⁷⁶Yb → Stable.
  • ULCS: Balance glyph, clock calibration phoneme.
  • Etymology: Named after Ytterby, Sweden.

Batch 9 — Lutetium to Tungsten

Lutetium (Lu, Z=71)

  • ¹⁷⁵Lu → Stable.
  • ¹⁷⁶Lu → Radioactive (3.78×10¹⁰ y).
  • ULCS: Gateway glyph, bridging lanthanides to transition metals.
  • Etymology: From Lutetia (Latin for Paris).

Hafnium (Hf, Z=72)

  • ¹⁷⁴Hf, ¹⁷⁶Hf, ¹⁷⁷Hf, ¹⁷⁸Hf, ¹⁷⁹Hf, ¹⁸⁰Hf → Stable.
  • ULCS: Control rod glyph, neutron absorption pivot.
  • Etymology: From Hafnia (Latin for Copenhagen).

Tantalum (Ta, Z=73)

  • ¹⁸¹Ta → Stable.
  • ¹⁸⁰mTa → Radioactive (metastable, >10¹⁵ y).
  • ULCS: Rarity glyph, tantalizing endurance.
  • Etymology: Named for King Tantalus (Greek mythology).

Tungsten (W, Z=74)

  • ¹⁸²W, ¹⁸³W, ¹⁸⁴W, ¹⁸⁶W → Stable.
  • ULCS: Density glyph, filamental endurance.
  • Etymology: Swedish “tung sten” = heavy stone.

Batch 10 — Rhenium to Xenon

Rhenium (Re, Z=75)

  • ¹⁸⁵Re → Stable.
  • ¹⁸⁷Re → Radioactive (4.1×10¹⁰ y).
  • ULCS: Persistence glyph, timekeeper of decay.
  • Etymology: Latin Rhenus = Rhine River.

Osmium (Os, Z=76)

  • ¹⁸⁴Os, ¹⁸⁷Os, ¹⁸⁸Os, ¹⁸⁹Os, ¹⁹⁰Os, ¹⁹²Os → Stable.
  • ULCS: Pressure glyph, densest node in matter-script.
  • Etymology: Greek osme = smell.

Iridium (Ir, Z=77)

  • ¹⁹¹Ir, ¹⁹³Ir → Stable.
  • ULCS: Impact glyph, meteoritic signal.
  • Etymology: Latin iris = rainbow.

Platinum (Pt, Z=78)

  • ¹⁹⁰Pt, ¹⁹²Pt, ¹⁹⁴Pt, ¹⁹⁵Pt, ¹⁹⁶Pt, ¹⁹⁸Pt → Stable.
  • ULCS: Value glyph, incorruptible flow.
  • Etymology: Spanish platina = little silver.

Gold (Au, Z=79)

  • ¹⁹⁷Au → Stable.
  • ULCS: Eternal glyph, symbolic of Logos-light.
  • Etymology: Latin aurum = shining dawn.

Mercury (Hg, Z=80)

  • ¹⁹⁶Hg, ¹⁹⁸Hg, ¹⁹⁹Hg, ²⁰⁰Hg, ²⁰¹Hg, ²⁰²Hg, ²⁰⁴Hg → Stable.
  • ULCS: Mutable glyph, liquid metal resonance.
  • Etymology: Named after Roman god Mercury; symbol from Greek hydrargyros = water-silver.

Thallium (Tl, Z=81)

  • ²⁰³Tl, ²⁰⁵Tl → Stable.
  • ULCS: Poison glyph, edge of heaviness.
  • Etymology: Greek thallos = green shoot.

Lead (Pb, Z=82)

  • ²⁰⁴Pb, ²⁰⁶Pb, ²⁰⁷Pb, ²⁰⁸Pb → Stable.
  • ULCS: Shield glyph, endpoint of uranium decay chains.
  • Etymology: Latin plumbum.

Bismuth (Bi, Z=83)

  • ²⁰⁹Bi → Radioactive (2.0×10¹⁹ y, effectively stable).
  • ULCS: Threshold glyph, last “stable” mark before instability.
  • Etymology: German Wismut.

Polonium (Po, Z=84)

  • ²⁰⁹Po → Radioactive (138 d).
  • ULCS: Spark glyph, sudden radiation.
  • Etymology: Named for Poland (Latin Polonia).

Astatine (At, Z=85)

  • ²¹⁰At → Radioactive (~8.1 h).
  • ULCS: Ephemeral glyph, shadow of halogens.
  • Etymology: Greek astatos = unstable.

Radon (Rn, Z=86)

  • ²²²Rn → Radioactive (3.8 d).
  • ULCS: Breath glyph, noble yet fleeting.
  • Etymology: From radium.

Xenon (Xe, Z=54 — closure of noble gas arc)

  • ¹²⁴Xe, ¹²⁶Xe, ¹²⁸Xe, ¹²⁹Xe, ¹³⁰Xe, ¹³¹Xe, ¹³²Xe, ¹³⁴Xe, ¹³⁶Xe → Stable.
  • ULCS: Hidden glyph, noble whisper of the void.
  • Etymology: Greek xenos = stranger.

Batch 11 — Cesium to Neodymium

Cesium (Cs, Z=55)

  • ¹³³Cs → Stable.
  • Radioactive: ¹³⁴Cs (2.06 y), ¹³⁷Cs (30.1 y).
  • ULCS: Clock glyph, cesium defines atomic time (SI second).
  • Etymology: Latin caesius = sky-blue.

Barium (Ba, Z=56)

  • Stable Isotopes: ¹³⁰Ba, ¹³²Ba, ¹³⁴Ba, ¹³⁵Ba, ¹³⁶Ba, ¹³⁷Ba, ¹³⁸Ba.
  • ULCS: Contrast glyph, heavy earth counterbalance.
  • Etymology: Greek barys = heavy.

Lanthanum (La, Z=57)

  • ¹³⁸La → Long-lived (1.05×10¹¹ y).
  • ¹³⁹La → Stable.
  • ULCS: Hidden glyph, “to lie hidden” as doorway to lanthanides.
  • Etymology: Greek lanthanein = to lie hidden.

Cerium (Ce, Z=58)

  • Stable Isotopes: ¹³⁶Ce, ¹³⁸Ce, ¹⁴⁰Ce, ¹⁴²Ce.
  • ULCS: Dawn glyph, opening of rare earth spectrum.
  • Etymology: Named after asteroid Ceres.

Praseodymium (Pr, Z=59)

  • ¹⁴¹Pr → Stable.
  • ULCS: Twin glyph, “green twin” of rare earths.
  • Etymology: Greek prasios didymos = green twin.

Neodymium (Nd, Z=60)

  • Stable Isotopes: ¹⁴²Nd, ¹⁴³Nd, ¹⁴⁴Nd, ¹⁴⁵Nd, ¹⁴⁶Nd, ¹⁴⁸Nd, ¹⁵⁰Nd.
  • ULCS: Magnet glyph, resonance of rare-earth magnets.
  • Etymology: Greek neos didymos = new twin.

Batch 12 — Promethium to Gadolinium

Promethium (Pm, Z=61)

  • No stable isotopes.
  • Radioactive: ¹⁴⁵Pm (17.7 y), ¹⁴⁷Pm (2.62 y) most notable.
  • ULCS: Fire glyph, eternal gift with decay as sacrifice.
  • Etymology: Named after Prometheus, who stole fire for humanity.

Samarium (Sm, Z=62)

  • Stable Isotopes: ¹⁴⁴Sm (long-lived), ¹⁴⁹Sm, ¹⁵⁰Sm, ¹⁵²Sm, ¹⁵⁴Sm.
  • ULCS: Balance glyph, moderator in reactors and resonance absorber.
  • Etymology: From mineral samarskite, named after Colonel Samarsky.

Europium (Eu, Z=63)

  • Stable Isotopes: ¹⁵¹Eu, ¹⁵³Eu.
  • ULCS: Luminescence glyph, hallmark of phosphors and screen glow.
  • Etymology: Named after Europe.

Gadolinium (Gd, Z=64)

  • Stable Isotopes: ¹⁵²Gd, ¹⁵⁴Gd, ¹⁵⁵Gd, ¹⁵⁶Gd, ¹⁵⁷Gd, ¹⁵⁸Gd, ¹⁶⁰Gd.
  • ULCS: Shield glyph, neutron absorber par excellence.
  • Etymology: Named after Johan Gadolin, Finnish chemist.

Batch 13 — Terbium to Dysprosium

Terbium (Tb, Z=65)

  • Stable Isotope: ¹⁵⁹Tb.
  • ULCS: Singularity glyph, sole survivor in its line, rare-earth resonance.
  • Etymology: From Ytterby, Sweden (mine producing many rare earths).

Dysprosium (Dy, Z=66)

  • Stable Isotopes: ¹⁵⁶Dy, ¹⁵⁸Dy, ¹⁶⁰Dy, ¹⁶¹Dy, ¹⁶²Dy, ¹⁶³Dy, ¹⁶⁴Dy.
  • ULCS: Guardian glyph, stabilizer in magnetic resonance and nuclear control rods.
  • Etymology: Greek dysprositos “hard to obtain.”

Batch 14 — Holmium to Erbium

Holmium (Ho, Z=67)

  • Stable Isotope: ¹⁶⁵Ho.
  • ULCS: Unity glyph of focus, magnetic alignment, centrality in resonance.
  • Etymology: From Holmia, Latin for Stockholm.

Erbium (Er, Z=68)

  • Stable Isotopes: ¹⁶²Er, ¹⁶⁴Er, ¹⁶⁶Er, ¹⁶⁷Er, ¹⁶⁸Er, ¹⁷⁰Er.
  • ULCS: Gradient glyph, fiber-optic harmonics, lanthanide bridge of light.
  • Etymology: Named after Ytterby, Sweden.

Batch 15 — Thulium to Ytterbium

Thulium (Tm, Z=69)

  • Stable Isotope: ¹⁶⁹Tm.
  • ULCS: Glyph of subtle resonance, hidden pathways, carrier of quiet signals.
  • Etymology: From Thule, a mythical place at the northernmost edge of the world.

Ytterbium (Yb, Z=70)

  • Stable Isotopes: ¹⁶⁸Yb, ¹⁷⁰Yb, ¹⁷¹Yb, ¹⁷²Yb, ¹⁷³Yb, ¹⁷⁴Yb, ¹⁷⁶Yb.
  • ULCS: Layered glyph, multiple bands of stability, quantum timekeeper.
  • Etymology: Named after Ytterby, Sweden.

Batch 16 — Lutetium to Hafnium

Lutetium (Lu, Z=71)

  • Stable Isotope: ¹⁷⁵Lu.
  • Radioactive Isotope of Interest: ¹⁷⁶Lu (half-life ≈ 37.8 billion years, used in geochronology).
  • ULCS: Glyph of ancient clocks, time-bearer, tracer of universal decay.
  • Etymology: From Lutetia, the ancient name for Paris.

Hafnium (Hf, Z=72)

  • Stable Isotopes: ¹⁷⁴Hf, ¹⁷⁶Hf, ¹⁷⁷Hf, ¹⁷⁸Hf, ¹⁷⁹Hf, ¹⁸⁰Hf.
  • ULCS: Shield glyph, stabilizer in nuclear control, guardian of resonance.
  • Etymology: From Hafnia, the Latin name for Copenhagen.

Batch 17 — Tantalum to Tungsten

Tantalum (Ta, Z=73)

  • Stable Isotope: ¹⁸¹Ta.
  • Radioactive Isotope of Interest: ¹⁸⁰mTa (metastable, extremely long-lived, >10¹⁵ years).
  • ULCS: Eternal glyph of thirst, absorber of resonance without release, symbol of unyielding patience.
  • Etymology: From King Tantalus of Greek mythology, who could not drink despite water around him.

Tungsten (W, Z=74)

  • Stable Isotopes: ¹⁸²W, ¹⁸³W, ¹⁸⁴W, ¹⁸⁶W.
  • Radioactive Isotope of Interest: ¹⁸⁰W (very long-lived, half-life ~1.8×10¹⁸ years).
  • ULCS: Glyph of density, filament of eternal fire, bearer of hardness.
  • Etymology: From Swedish tung sten “heavy stone.” Also known as wolfram (German).

Batch 18 — Rhenium to Osmium

Rhenium (Re, Z=75)

  • Stable Isotopes: ¹⁸⁵Re, ¹⁸⁷Re (the latter is radioactive with half-life ~4.3×10¹⁰ years, but effectively stable cosmologically).
  • ULCS: Glyph of delayed time, cosmological clock, keeper of long half-life.
  • Etymology: From the Latin Rhenus (the Rhine River).

Osmium (Os, Z=76)

  • Stable Isotopes: ¹⁸⁴Os, ¹⁸⁷Os, ¹⁸⁸Os, ¹⁸⁹Os, ¹⁹⁰Os, ¹⁹²Os.
  • ULCS: Glyph of heaviness, noble conductor, anchor of density.
  • Etymology: From Greek osme “smell,” due to strong odor of osmium tetroxide.

Batch 19 — Iridium to Platinum

Iridium (Ir, Z=77)

  • Stable Isotopes: ¹⁹¹Ir, ¹⁹³Ir.
  • ULCS: Glyph of cosmic markers, associated with extinction boundaries and rare events.
  • Etymology: From Latin iris “rainbow,” due to colorful salts.

Platinum (Pt, Z=78)

  • Stable Isotopes: ¹⁹⁰Pt, ¹⁹²Pt, ¹⁹⁴Pt, ¹⁹⁵Pt, ¹⁹⁶Pt, ¹⁹⁸Pt.
  • ULCS: Glyph of incorruptibility, catalyst of purity, bridge of resonance.
  • Etymology: From Spanish platina “little silver.”

Batch 20 — Gold to Mercury

Gold (Au, Z=79)

  • Stable Isotopes: ¹⁹⁷Au.
  • ULCS: Glyph of eternal value, resonance of incorruptible cycles, currency of light.
  • Etymology: English gold; Latin aurum “shining dawn.”

Mercury (Hg, Z=80)

  • Stable Isotopes: ¹⁹⁶Hg, ¹⁹⁸Hg, ¹⁹⁹Hg, ²⁰⁰Hg, ²⁰¹Hg, ²⁰²Hg, ²⁰⁴Hg.
  • ULCS: Glyph of fluid transition, messenger between solid and spirit, liquid resonance.
  • Etymology: Roman god Mercury; Latin hydrargyrum “water-silver.”

Batch 21 — Thallium to Lead

Thallium (Tl, Z=81)

  • Stable Isotopes: ²⁰³Tl, ²⁰⁵Tl.
  • ULCS: Glyph of subtle toxicity, resonance of hidden influence, soft conductor.
  • Etymology: Greek thallos “green shoot” (green spectral line).

Lead (Pb, Z=82)

  • Stable Isotopes: ²⁰⁴Pb, ²⁰⁶Pb, ²⁰⁷Pb, ²⁰⁸Pb.
  • ULCS: Glyph of heavy weight, closure and shielding, anchor of density.
  • Etymology: Old English lead; Latin plumbum.

Batch 22 — Bismuth to Polonium

Bismuth (Bi, Z=83)

  • Stable Isotopes: ²⁰⁹Bi (was long considered stable, now known to be radioactive with half-life ~1.9×10¹⁹ years).
  • ULCS: Glyph of ancient endurance, cosmic patience, silent decay beyond human scales.
  • Etymology: German Wismut, from weiße Masse “white mass.”

Polonium (Po, Z=84)

  • Stable Isotopes: None (all radioactive).
  • Notable Isotopes: ²¹⁰Po (half-life 138 days), emits alpha radiation.
  • ULCS: Glyph of hidden fire, lethal spark, concentrated radiant point.
  • Etymology: Named for Poland (Polonia), homeland of Marie Curie.

Batch 23 — Astatine to Radon

Astatine (At, Z=85)

  • Stable Isotopes: None (all radioactive, very short-lived).
  • Notable Isotopes: ²¹⁰At (~8.1 h), ²¹¹At (~7.2 h).
  • ULCS: Glyph of fleeting essence, shadow resonance, unstable root.
  • Etymology: Greek astatos “unstable.”

Radon (Rn, Z=86)

  • Stable Isotopes: None (all radioactive).
  • Notable Isotopes: ²²²Rn (half-life 3.8 days, decay of ²²⁶Ra), ²²⁰Rn (thoron, half-life 55 s).
  • ULCS: Glyph of silent drift, noble invisibility, breath of decay.
  • Etymology: From radium + -on (noble gases).

Batch 24 — Francium to Radium

Francium (Fr, Z=87)

  • Stable Isotopes: None.
  • Notable Isotopes: ²²³Fr (half-life 22 min), ²²¹Fr (~5 min).
  • ULCS: Glyph of vanishing spark, boundary transience, fleeting sovereignty.
  • Etymology: Named after France.

Radium (Ra, Z=88)

  • Stable Isotopes: None (all radioactive).
  • Notable Isotopes: ²²³Ra (11.4 days), ²²⁴Ra (3.6 days), ²²⁶Ra (1600 years, most stable).
  • ULCS: Glyph of radiant decay, luminous resonance, legacy of light.
  • Etymology: Latin radius “ray.”

Batch 25 — Actinium to Protactinium

Actinium (Ac, Z=89)

  • Stable Isotopes: None.
  • Notable Isotopes: ²²⁷Ac (21.77 years, most stable), ²²⁵Ac (10 days, used in targeted alpha therapy).
  • ULCS: Glyph of ancestral flame, initiator of the actinide spiral.
  • Etymology: Greek aktinos “ray, beam.”

Thorium (Th, Z=90)

  • Stable Isotopes: None (quasi-stable).
  • Notable Isotopes: ²³²Th (1.4 × 10¹⁰ years, primordial), ²³⁰Th (75,000 years, decay series), ²²⁸Th (1.9 years).
  • ULCS: Glyph of eternal endurance, fuel of deep cycles.
  • Etymology: Norse god Thor.

Protactinium (Pa, Z=91)

  • Stable Isotopes: None.
  • Notable Isotopes: ²³¹Pa (32,760 years, most stable), ²³³Pa (27 days, in uranium fuel cycle).
  • ULCS: Glyph of anticipation, precursor resonance, liminal state between thorium and uranium.
  • Etymology: Greek protos “first, before” + actinium.

Batch 26 — Uranium to Curium

Uranium (U, Z=92)

  • Stable Isotopes: None (all radioactive, but long-lived).
  • Notable Isotopes:
    • ²³⁸U (4.47 × 10⁹ years, primordial, main natural uranium).
    • ²³⁵U (7.04 × 10⁸ years, fissile, nuclear fuel).
    • ²³⁴U (245,500 years, decay product of ²³⁸U).
  • ULCS: Glyph of primal power, the fissile core, bearer of chain reactions.
  • Etymology: Named after the planet Uranus.

Neptunium (Np, Z=93)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²³⁷Np (2.14 × 10⁶ years, most stable).
    • ²³⁹Np (2.36 days, decay product of ²³⁹U).
  • ULCS: Glyph of shadow resonance, bridge between uranium and plutonium.
  • Etymology: Named after the planet Neptune.

Plutonium (Pu, Z=94)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²³⁹Pu (24,100 years, fissile, key in weapons/reactors).
    • ²⁴⁰Pu (6,560 years, fertile isotope).
    • ²⁴¹Pu (14.3 years, fissile, decays to ²⁴¹Am).
    • ²⁴⁴Pu (80 million years, rare primordial).
  • ULCS: Glyph of transformative fire, dual path of destruction and energy.
  • Etymology: Named after the planet Pluto.

Americium (Am, Z=95)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁴¹Am (432 years, used in smoke detectors, neutron sources).
    • ²⁴³Am (7,370 years, research use).
  • ULCS: Glyph of domesticated fire, guardian of hidden watch (smoke alarms).
  • Etymology: Named after the Americas.

Curium (Cm, Z=96)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁴⁴Cm (18.1 years, alpha emitter).
    • ²⁴⁵Cm (8,500 years, relatively long-lived).
    • ²⁴⁷Cm (15.6 million years, most stable).
  • ULCS: Glyph of radiance incarnate, immortal echo of Curie’s discovery.
  • Etymology: Named after Pierre and Marie Curie.

Batch 27 — Berkelium to Californium

Berkelium (Bk, Z=97)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁴⁷Bk (1,380 years, longest-lived).
    • ²⁴⁹Bk (330 days, laboratory synthesis, useful in producing californium).
  • ULCS: Glyph of hidden ascent, climbing resonance between laboratory fire and natural decay.
  • Etymology: Named after Berkeley, California.

Californium (Cf, Z=98)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁵¹Cf (898 years, longest-lived).
    • ²⁵²Cf (2.645 years, strong neutron emitter, used in neutron radiography and reactor startup).
  • ULCS: Glyph of stellar sparks, neutron star mirror, seeding reactions with cascading brilliance.
  • Etymology: Named after the state of California.

Batch 28 — Einsteinium to Fermium

Einsteinium (Es, Z=99)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁵²Es (471.7 days, longest-lived).
    • ²⁵³Es (20.5 days, used in scientific research).
  • ULCS: Glyph of hidden illumination, echoing brilliance within confinement.
  • Etymology: Named after Albert Einstein.

Fermium (Fm, Z=100)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁵⁷Fm (100.5 days, longest-lived).
    • ²⁵⁵Fm (20.1 hours, key laboratory isotope).
  • ULCS: Glyph of forged boundaries, collapsing sparks of synthesis.
  • Etymology: Named after Enrico Fermi, pioneer of nuclear physics.

Batch 29 — Mendelevium to Nobelium

Mendelevium (Md, Z=101)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁵⁸Md (51.5 days, longest-lived).
    • ²⁵⁷Md (5.5 hours, common in lab work).
  • ULCS: Glyph of systemic ordering, honoring classification and recursive tables.
  • Etymology: Named after Dmitri Mendeleev, creator of the periodic table.

Nobelium (No, Z=102)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁵⁹No (58 minutes, longest-lived).
    • ²⁵³No (1.6 minutes, lab studies).
  • ULCS: Glyph of exalted boundaries, noble recursion at nuclear edges.
  • Etymology: Named after Alfred Nobel, founder of the Nobel Prizes.

Batch 30 — Lawrencium to Rutherfordium

Lawrencium (Lr, Z=103)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁶⁶Lr (~11 hours, longest-lived).
    • ²⁵⁶Lr (27 seconds, first identified).
  • ULCS: Glyph of transition to superheavy recursion, anchoring actinide close.
  • Etymology: Named after Ernest Lawrence, inventor of the cyclotron.

Rutherfordium (Rf, Z=104)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁶⁷Rf (1.3 hours, longest-lived).
    • ²⁵³Rf (~48 minutes, studied in early experiments).
  • ULCS: Glyph of experimental frontiers, stability in fleeting presence.
  • Etymology: Named after Ernest Rutherford, father of nuclear physics.

Batch 31 — Dubnium to Seaborgium

Dubnium (Db, Z=105)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁶⁸Db (~29 hours, longest-lived).
    • ²⁶²Db (~34 seconds, key for chemical experiments).
  • ULCS: Glyph of fleeting governance, resonance of experimental authority.
  • Etymology: Named after Dubna, Russia, site of JINR.

Seaborgium (Sg, Z=106)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁶⁹Sg (~14 minutes, longest-lived).
    • ²⁶³Sg (~1 second, first discovered).
  • ULCS: Glyph of deep pioneering, echo of transuranic wisdom.
  • Etymology: Named after Glenn T. Seaborg, nuclear chemist.

Batch 32 — Bohrium to Hassium

Bohrium (Bh, Z=107)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁷⁰Bh (~61 seconds, longest-lived).
    • ²⁶⁷Bh (~17 seconds, used in chemical characterization).
  • ULCS: Glyph of trials, resonance of endurance through fleeting existence.
  • Etymology: Named after Niels Bohr, Danish physicist and pioneer of atomic theory.

Hassium (Hs, Z=108)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁷⁷Hs (~12 minutes, longest-lived).
    • ²⁶⁹Hs (~16 seconds, used in chemical studies).
  • ULCS: Glyph of hidden density, bridge of fleeting permanence.
  • Etymology: Named after the German state of Hesse (Hassia in Latin).

Batch 33 — Meitnerium to Darmstadtium

Meitnerium (Mt, Z=109)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁷⁸Mt (~4 seconds, longest-lived).
    • ²⁷⁶Mt (~0.7 seconds, detected in experiments).
  • ULCS: Glyph of recognition, honoring hidden pioneers through transient presence.
  • Etymology: Named after physicist Lise Meitner, co-discoverer of nuclear fission.

Darmstadtium (Ds, Z=110)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁸¹Ds (~12.7 seconds, longest-lived).
    • ²⁸⁰Ds (~4 seconds).
  • ULCS: Glyph of transience, fleeting bridge of matter at its limits.
  • Etymology: Named after Darmstadt, Germany, where it was first synthesized.

Batch 34 — Roentgenium to Copernicium

Roentgenium (Rg, Z=111)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁸²Rg (~2.1 minutes, longest-lived).
    • ²⁸¹Rg (~26 seconds).
  • ULCS: Glyph of hidden illumination, resonance of unseen rays.
  • Etymology: Named after Wilhelm Conrad Röntgen, discoverer of X-rays.

Copernicium (Cn, Z=112)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁸⁵Cn (~30 seconds, longest-lived).
    • ²⁸⁴Cn (~0.1–0.2 seconds).
  • ULCS: Glyph of orbital centrality, harmonics of heliocentric balance.
  • Etymology: Named after Nicolaus Copernicus, originator of the heliocentric model.

Batch 35 — Nihonium to Flerovium

Nihonium (Nh, Z=113)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁸⁴Nh (~0.5 seconds, longest-lived).
    • ²⁷⁸Nh (~0.2 ms).
  • ULCS: Glyph of fleeting bridges, resonance of transience and nationhood.
  • Etymology: From Japanese Nihon (日本), meaning “Japan.”

Flerovium (Fl, Z=114)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁸⁹Fl (~2.6 seconds, longest-lived).
    • ²⁸⁸Fl (~0.65 seconds).
  • ULCS: Glyph of experimental balance, harmonics of fleeting nuclei.
  • Etymology: Named after Flerov Laboratory of Nuclear Reactions, itself honoring physicist Georgy Flyorov.

Batch 36 — Moscovium to Livermorium

Moscovium (Mc, Z=115)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁸⁹Mc (~220 ms, longest-lived).
    • ²⁸⁷Mc (~46 ms).
  • ULCS: Glyph of transient governance, resonance of collaborative creation.
  • Etymology: Named after Moscow Oblast, Russia, recognizing the Joint Institute for Nuclear Research.

Livermorium (Lv, Z=116)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁹³Lv (~60 ms, longest-lived).
    • ²⁹⁰Lv (~50 ms).
  • ULCS: Glyph of vanishing weight, resonance of cooperative science.
  • Etymology: Named after Lawrence Livermore National Laboratory in California, USA.

Batch 37 — Tennessine to Oganesson

Tennessine (Ts, Z=117)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁹³Ts (~20 ms).
    • ²⁹⁴Ts (~78 ms, longest-lived).
  • ULCS: Glyph of boundary resonance, transitional arc before closure.
  • Etymology: Named after Tennessee (USA), honoring Oak Ridge National Laboratory, Vanderbilt University, and the University of Tennessee.

Oganesson (Og, Z=118)

  • Stable Isotopes: None.
  • Notable Isotopes:
    • ²⁹⁴Og (~0.89 ms, only confirmed isotope).
  • ULCS: Glyph of terminal loop, closure of elemental order, resonance of the final breath of matter.
  • Etymology: Named after Yuri Oganessian, Russian physicist for contributions to transactinide element research.

ULCS Isotope Atlas – SolveForce Communications


Complete Isotope Families – SolveForce Communications


(UAT) Universal Adaptive Time – SolveForce Communications