Unified Elements Directory

(UED)

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Canonical, registry-ready directory aligning isotopes, roles, and applications.

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Z 1–10

Z	Symbol	Element	Key Isotopes	Immediate Role	Applications
1	H	Hydrogen	1H, 2H(D), 3H	Life, water, fusion	Water, fuels, fusion
2	He	Helium	3He, 4He	Cryogenics, fusion	MRI cooling, superfluids
3	Li	Lithium	6Li, 7Li	Batteries, fusion targets	Li-ion storage, ceramics
4	Be	Beryllium	9Be	Alloys, neutron reflector	Aerospace, moderators
5	B	Boron	10B, 11B	Neutron capture, therapy	Control rods, BNCT
6	C	Carbon	12C, 13C, 14C	Life, materials, dating	Polymers, graphite/diamond
7	N	Nitrogen	14N, 15N	Proteins/DNA, fertilizers	Ammonia cycle, atmosphere
8	O	Oxygen	16O, 17O, 18O	Respiration, water	Medicine, oxidants, steel
9	F	Fluorine	19F	Medicinals, polymers	PTFE, tooth enamel
10	Ne	Neon	20Ne, 21Ne, 22Ne	Lighting, cryogenics	Neon lamps, lasers

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Z 11–20

Z	Symbol	Element	Key Isotopes	Immediate Role	Applications
11	Na	Sodium	23Na	Electrolyte, biochem	Medicine, salts
12	Mg	Magnesium	24Mg, 25Mg, 26Mg	Enzymes, chlorophyll	Alloys, nutrition
13	Al	Aluminum	27Al	Materials, conductors	Aerospace, packaging
14	Si	Silicon	28Si, 29Si, 30Si	Semiconductors, glass	Chips, solar PV
15	P	Phosphorus	31P	DNA/ATP backbone	Fertilizers, NMR (31P)
16	S	Sulfur	32S, 33S, 34S, 36S	Proteins, environment	Vulcanization, sulfuric acid
17	Cl	Chlorine	35Cl, 37Cl	Electrolyte, disinfectant	PVC, water treatment
18	Ar	Argon	36Ar, 38Ar, 40Ar	Inert gas, dating	Welding, K–Ar dating
19	K	Potassium	39K, 40K, 41K	Nerves, dating	Fertilizer, medicine
20	Ca	Calcium	40Ca, 44Ca, 48Ca	Bones, signaling	Cement, biomaterials

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Z 21–30

Z	Symbol	Element	Key Isotopes	Immediate Role	Applications
21	Sc	Scandium	45Sc	Alloys, lighting	Aerospace, lamps
22	Ti	Titanium	46–50Ti	Biomaterials, strength	Implants, aerospace
23	V	Vanadium	50V, 51V	Catalysis, alloys	Steel hardening
24	Cr	Chromium	50–54Cr	Metallurgy, pigments	Stainless steel
25	Mn	Manganese	55Mn	Enzymes, alloys	Batteries, steel
26	Fe	Iron	54–58Fe	Hemoglobin, cores	Construction, catalysts
27	Co	Cobalt	59Co, 60Co	B12, magnets, radiotherapy	Alloys, medical γ-source
28	Ni	Nickel	58–64Ni	Catalysis, alloys	Superalloys, coins
29	Cu	Copper	63Cu, 65Cu	Conductivity, enzymes	Wiring, antimicrobial
30	Zn	Zinc	64–70Zn	Enzymes, immunity	Galvanization, alloys

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Z 31–40

Z	Symbol	Element	Key Isotopes	Immediate Role	Applications
31	Ga	Gallium	69Ga, 71Ga	Semiconductors	LEDs, photovoltaics
32	Ge	Germanium	70–76Ge	Semiconductors, detectors	IR optics, electronics
33	As	Arsenic	75As	Semiconductors, toxicology	Medicinal, GaAs
34	Se	Selenium	74–82Se	Enzymes, solar	Glass, photovoltaics
35	Br	Bromine	79Br, 81Br	Chemistry, tracers	Flame retardants, medicine
36	Kr	Krypton	78–86Kr	Lighting, lasers	Nuclear tracers
37	Rb	Rubidium	85Rb, 87Rb	Clocks, dating	Lasers, chronometers
38	Sr	Strontium	84–88Sr	Dating, materials	90Sr therapy, ceramics
39	Y	Yttrium	89Y	Superconductors, lasers	Alloys, YBCO
40	Zr	Zirconium	90–96Zr	Nuclear cladding	Alloys, ceramics

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Z 41–50

Z	Symbol	Element	Key Isotopes	Immediate Role	Applications
41	Nb	Niobium	93Nb	Superconductors	MRI magnets, alloys
42	Mo	Molybdenum	92–100Mo	Enzymes, catalysis	Imaging, fertilizers
43	Tc	Technetium	99mTc	Medical imaging	SPECT tracer
44	Ru	Ruthenium	96–106Ru	Catalysts, electronics	Solar, medicine
45	Rh	Rhodium	103Rh	Catalysis, alloys	Industry, jewelry
46	Pd	Palladium	102–110Pd	H storage, catalysis	Fuel cells, jewelry
47	Ag	Silver	107Ag, 109Ag	Conductors, medicine	Electronics, tracers
48	Cd	Cadmium	106–116Cd	Neutron absorbers	Control rods, pigments
49	In	Indium	113In, 115In	Semiconductors	ITO, touchscreens
50	Sn	Tin	112–124Sn	Alloys, dating	Solder, bronze

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Z 51–60

Z	Symbol	Element	Key Isotopes	Immediate Role	Applications
51	Sb	Antimony	121Sb, 123Sb	Semiconductors, tracers	Alloys, diodes
52	Te	Tellurium	120–130Te	Thermoelectrics	Solar cells, alloys
53	I	Iodine	127I, 131I	Endocrine, therapy	Thyroid hormones, radiotherapy
54	Xe	Xenon	124–136Xe	Imaging, tracers	MRI, anesthesia
55	Cs	Cesium	133Cs, 137Cs	Timekeeping, fallout	Atomic clocks, monitoring
56	Ba	Barium	130–138Ba	Ceramics, tracers	Superconductors, medicine
57	La	Lanthanum	138La, 139La	Catalysts, dating	Alloys, optics
58	Ce	Cerium	136–142Ce	Catalysts, fission	Glass polishing, reactors
59	Pr	Praseodymium	141Pr	Magnets, ceramics	Phosphors, alloys
60	Nd	Neodymium	142–150Nd	Magnets, lasers	Renewables, magnets

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Z 61–70

Z	Symbol	Element	Key Isotopes	Immediate Role	Applications
61	Pm	Promethium	145Pm, 147Pm	Betavoltaics, tracers	Luminous paint, gauges
62	Sm	Samarium	144–154Sm	Neutron absorber, magnets	Control rods, SmCo magnets
63	Eu	Europium	151, 153Eu	Phosphors, tracers	LEDs, lasers
64	Gd	Gadolinium	152–160Gd	MRI contrast, absorbers	Medicine, reactors
65	Tb	Terbium	159Tb	Phosphors, magnets	Lasers, electronics
66	Dy	Dysprosium	156–164Dy	Magnets, shielding	Turbines, reactors
67	Ho	Holmium	165Ho	Magnetic alloys, therapy	Nuclear medicine
68	Er	Erbium	162–170Er	Optical amplifiers	Telecom, lasers
69	Tm	Thulium	169Tm	Portable X-ray, therapy	Lasers, gauges
70	Yb	Ytterbium	168–176Yb	Quantum optics, lasers	Atomic clocks, superconductors

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Z 71–80

Z	Symbol	Element	Key Isotopes	Immediate Role	Applications
71	Lu	Lutetium	175, 176, 177Lu	Therapy, dating	Radiotherapy, geochronology
72	Hf	Hafnium	174–180Hf	Reactors, superalloys	Control rods, aerospace
73	Ta	Tantalum	181Ta	Electronics, isomer	Capacitors, turbines
74	W	Tungsten	180–186W	Superalloys, geochron	Lighting, aerospace
75	Re	Rhenium	185Re, 187Re	Catalysts, dating	Pt–Re catalysts, geochron
76	Os	Osmium	184–192Os	Geochemistry, alloys	Core–mantle tracer
77	Ir	Iridium	191, 193Ir	Catalysts, radiotherapy	Industry, impact marker
78	Pt	Platinum	190–198Pt	Catalysts, fuel cells	Chemistry, jewelry
79	Au	Gold	197Au	Value, therapy	Finance, nanotech
80	Hg	Mercury	196–204Hg	Env. cycles, medicine	Pollution tracers

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Z 81–90

Z	Symbol	Element	Key Isotopes	Immediate Role	Applications
81	Tl	Thallium	203, 205Tl	Toxicology, imaging	Cardiac imaging
82	Pb	Lead	204–208Pb	Shielding, dating	Radiation, sediments
83	Bi	Bismuth	209Bi	Alloys, tracers	Pharma, decay studies
84	Po	Polonium	210Po	RTGs, α-therapy	Space power, medicine
85	At	Astatine	210, 211At	Targeted α-therapy	Cancer research
86	Rn	Radon	222Rn	Environmental hazard	Health physics
87	Fr	Francium	223Fr	Nuclear research	Actinium chain
88	Ra	Radium	223–228Ra	Radiotherapy, tracers	Geology, medicine
89	Ac	Actinium	225Ac	Targeted α-therapy	Cancer treatment
90	Th	Thorium	232Th	Fuel, dating	MSR fuel, U–Th dating

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Z 91–100

Z	Symbol	Element	Key Isotopes	Immediate Role	Applications
91	Pa	Protactinium	231Pa	Geochronology, fuel	Ocean sediments
92	U	Uranium	233–238U	Fuel, dating	Reactors, weapons
93	Np	Neptunium	237Np	Waste tracer, fuel link	Nuclear cycle
94	Pu	Plutonium	238–242Pu	Fuel, RTGs, waste	Reactors, NASA probes
95	Am	Americium	241Am	Devices, waste	Smoke detectors, medicine
96	Cm	Curium	244–247Cm	Heat sources, waste	RTGs, stewardship
97	Bk	Berkelium	247, 249Bk	Research, precursor	Superheavy synthesis
98	Cf	Californium	249–252Cf	Neutron source	Reactors, therapy
99	Es	Einsteinium	252–253Es	Research, synthesis	Producing Md
100	Fm	Fermium	255–257Fm	Research	Heavy actinide studies

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Z 101–110

Z	Symbol	Element	Key Isotopes	Immediate Role	Applications
101	Md	Mendelevium	258Md	Research	Nuclear chemistry
102	No	Nobelium	259No	Research	Shell studies
103	Lr	Lawrencium	266Lr	Research	Actinide closure
104	Rf	Rutherfordium	261Rf	Research	Transactinide opener
105	Db	Dubnium	262Db	Research	Nuclear structure
106	Sg	Seaborgium	265–269Sg	Research	Heavy-ion synthesis
107	Bh	Bohrium	267–271Bh	Research	Nuclear shell
108	Hs	Hassium	269–271Hs	Research	Superheavy studies
109	Mt	Meitnerium	276–278Mt	Research	Nuclear experiments
110	Ds	Darmstadtium	279–281Ds	Research	Shell structure

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Z 111–118

Z	Symbol	Element	Key Isotopes	Immediate Role	Applications
111	Rg	Roentgenium	280–282Rg	Research	Symbolic codon
112	Cn	Copernicium	283–285Cn	Research	Superheavy frontier
113	Nh	Nihonium	278–284Nh	Research	Cultural codon
114	Fl	Flerovium	287–289Fl	Research	Shell stability
115	Mc	Moscovium	287–289Mc	Research	Geopolitical codon
116	Lv	Livermorium	291–293Lv	Research	Institutional codon
117	Ts	Tennessine	293–294Ts	Research	Regional codon
118	Og	Oganesson	294Og	Research frontier	Heaviest element

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📊 Analytics hooks

• Isotope spread → stable vs radioactive counts
• Roles by sector → Biochem, Energy, Materials, Research
• Element–application network → edges ready for Knowledge Graph import

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Elements One Through One Hundred Eighteen – SolveForce Communications

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📖 ULCS Isotope Atlas — Master File – SolveForce Communications

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Enriching the Circular Economy Integration – SolveForce Communications

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Isotope Master Summary

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