Notation. Nuclides are written with the mass number as a left superscript (e.g., ²⁸⁹Fl).
Columns. Stable? — Flerovium 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 flerovium (ENSDF/NUBASE 2020).
Table — ground states
| Nuclide | Z | A | Stable? | Half-life | Decay → daughter(s) | Radiation | Origin | Notes & Uses |
|---|---|---|---|---|---|---|---|---|
| ²⁸⁵Fl | 114 | 285 | No | 0.58 ms | SF (dominant) | SF | Fusion-evap. | R. |
| ²⁸⁶Fl | 114 | 286 | No | 130 ms | α → ²⁸²Cn | α | Synthetic | R. |
| ²⁸⁷Fl | 114 | 287 | No | 5.5 s | α → ²⁸³Cn | α | Synthetic | R. |
| ²⁸⁸Fl | 114 | 288 | No | 0.8 s | α → ²⁸⁴Cn | α | Synthetic | R. |
| ²⁸⁹Fl | 114 | 289 | No | 1.9 s | α → ²⁸⁵Cn | α | Synthetic (Dubna–LLNL) | Key isotope in discovery. |
| ²⁹⁰Fl | 114 | 290 | No | 19 s | α → ²⁸⁶Cn | α | Synthetic | Longer-lived; mapped in decay chains. |
| ²⁹¹Fl | 114 | 291 | No | 0.9 ms | SF (dominant) | SF | Synthetic | R. |
| ²⁹²Fl | 114 | 292 | No | 2.6 s | α → ²⁸⁸Cn; SF | α; SF | Synthetic | R. |
| ²⁹³Fl | 114 | 293 | No | 0.48 s | α → ²⁸⁹Cn | α | Synthetic | R. |
| ²⁹⁴Fl | 114 | 294 | No | 2.6 s | α → ²⁹⁰Cn; SF | α; SF | Synthetic | Longest-lived confirmed Fl isotope. |
Natural isotopes of flerovium
- None.
- All isotopes are synthetic, first produced in 1998–1999 at JINR Dubna by bombarding plutonium-244 with calcium-48 ions.
Applied & research highlights
- ²⁹⁰Fl (19 s) and ²⁹⁴Fl (2.6 s): the most long-lived isotopes, useful in mapping decay chains toward elements 112 (Cn) and 110 (Ds).
- Flerovium is in Group 14 of the periodic table (like Pb, Sn), but relativistic effects may make it behave more like a noble gas.
- Gas-phase adsorption experiments suggest weak metallic bonding, unlike lead, making its chemistry unique among heavy elements.
- No practical uses — fundamental nuclear structure and chemistry studies only.
Totals — Flerovium (Z = 114)
- Ground-state isotopes listed: 10 (A = 285–294).
- Stable: 0.
- Unstable: 10.
Running cumulative totals (through Fl):
From Nh ledger: ≥ 3 323 total, 252 stable, ≥ 3 070 unstable.
Add Fl (+10 total, +0 stable, +10 unstable) → ≥ 3 333 total, 252 stable, ≥ 3 080 unstable.
Sources
- Isotopic list (A = 285–294): Isotopes of flerovium (ENSDF/NUBASE 2020).
- Discovery (1998–1999, Dubna–LLNL): Ca-48 + Pu-244 fusion.
- Chemistry experiments: adsorption studies hinting at noble-gas-like behavior.
Next element: Moscovium — Mc (Z = 115).