Hassium
transition metalProperties
| Property | Value |
|---|---|
| Atomic Mass | 277 amu |
| Category | transition metal |
| Group | 8 |
| Period | 7 |
| Electron Configuration | [Rn] 5f14 6d6 7s2 |
| Oxidation States | 8, 6, 5, 4, 3, 2 |
| Discovered By | Peter Armbruster, Gottfried Munzenberg, GSI Helmholtzzentrum (1984) |
About Hassium
Hassium is the heaviest element whose chemistry has actually been measured rather than just predicted, and that one experiment is the whole reason it's interesting to a chemist. In 2002, a team at GSI fired ²⁶Mg at a ²⁴⁸Cm target, made a handful of ²⁶⁹Hs atoms, and walked each one — atom by atom — through a chromatography column with O₂ flowing across hot silicon detectors. The atoms formed a volatile tetroxide, HsO₄, that deposited at the same temperature range as OsO₄. That settles a real question: relativistic effects on the 6d and 7s electrons could in principle push group 8 chemistry off the periodic-table trend, but here it didn't. Hs-269 has a half-life around 16 seconds, so each measurement is also a race against alpha decay. No bulk sample has ever existed, and none ever will at lab scale.
Fun Fact
Scientists proved hassium behaves like osmium by reacting individual atoms with oxygen in flight — each hassium atom had only seconds to live, yet researchers managed to confirm it forms a tetroxide just like its lighter group 8 relatives.
Common Uses
- Single-atom chemistry experiments confirming group 8 periodicity
- Tests of relativistic effects on transactinide electron shells
- Cross-section measurements for hot-fusion reaction studies
- Decay-chain anchors for identifying heavier superheavy nuclei
- No commercial applications