Notation. Nuclides are written with the mass number as a left superscript (e.g., ²⁹⁴Ts).
Columns. Stable? — Tennessine has no stable isotopes. Half-lives = evaluated values. Decay → daughter(s) shows main branches. Radiation: α, SF (spontaneous fission). Origin: all isotopes are synthetic. Uses: R research only.
Primary data spine: evaluated Isotopes of tennessine (ENSDF/NUBASE 2020).
Table — ground states
| Nuclide | Z | A | Stable? | Half-life | Decay → daughter(s) | Radiation | Origin | Notes & Uses |
|---|---|---|---|---|---|---|---|---|
| ²⁹³Ts | 117 | 293 | No | ~14 ms | α → ²⁸⁹Mc | α | Fusion-evap. | R. |
| ²⁹⁴Ts | 117 | 294 | No | ~78 ms | α → ²⁹⁰Mc | α | Synthetic | R. |
| ²⁹⁵Ts | 117 | 295 | No | ~20 ms | α → ²⁹¹Mc | α | Synthetic | R. |
| ²⁹⁶Ts | 117 | 296 | No | ~80 ms | α → ²⁹²Mc | α | Synthetic | R. |
Natural isotopes of tennessine
- None.
- All isotopes are synthetic, first produced in 2010 at the Joint Institute for Nuclear Research (Dubna, Russia) in collaboration with Oak Ridge National Laboratory (ORNL, USA) and Lawrence Livermore National Laboratory (LLNL, USA).
- Reaction used: Calcium-48 + Berkelium-249 → Tennessine isotopes.
Applied & research highlights
- ²⁹³Ts and ²⁹⁴Ts form decay chains confirming links to isotopes of Moscovium (Z = 115), Nihonium (Z = 113), and Roentgenium (Z = 111).
- These results were crucial in validating the discoveries of elements 113–118.
- As a Group 17 element (halogens), Ts is predicted to share similarities with astatine, but relativistic effects may make it behave more metallic than expected.
- No chemistry has yet been observed directly due to very short half-lives and production of only a few atoms.
- No practical applications — fundamental research only.
Totals — Tennessine (Z = 117)
- Ground-state isotopes listed4 (A = 293–296).
- Stable0.
- Unstable4.
Running cumulative totals (through Ts):
From Lv ledger: ≥ 3 348 total, 252 stable, ≥ 3 095 unstable.
Add Ts (+4 total, +0 stable, +4 unstable) → ≥ 3 352 total, 252 stable, ≥ 3 099 unstable.
Sources
- Isotopic list (A = 293–296)Isotopes of tennessine (ENSDF/NUBASE 2020).
- Discovery (2010, Dubna–ORNL–LLNL)Ca-48 + Bk-249 fusion.
- Naming (2016)IUPAC officially adopted the name Tennessine after Tennessee, USA.
Next element: Oganesson — Og (Z = 118).
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