Hassium
transition metal · period 7 · group 8 · d-block
Hassium is a chemical element with the symbol Hs and the atomic number 108. Hassium is highly radioactive; its most stable known isotopes have half-lives of approximately ten seconds.
What the numbers say
At standard temperature and pressure Hassium is a solid, sitting in period 7, group 8 of the d-block.
Its melting point of 126 K (-147 °C) is the 102nd highest of the 110 elements with a measured value — among the lowest-melting elements.
First identified in 1984.
Check it against computed structures
The structure search queries the Materials Project, OQMD and the Open Materials Database for computed crystal structures containing Hs — with DFT formation energy, hull stability and band gap where the provider publishes them.
K 2 · L 8 · M 18 · N 32 · O 32 · P 14 · Q 2
Properties
| Atomic number | 108 |
|---|---|
| Atomic mass | 269 u |
| Series | transition metal |
| Group | 8 |
| Period | 7 |
| Block | d-block |
| Phase at STP | Solid |
| Melting point | 126 K (-147 °C) |
| Electron configuration | *[Rn] 5f¹⁴ 6d⁶ 7s² |
| Oxidation states | 8 |
| Discovered | 1984 |
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See Hs in context with all 118 elements.
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Ask the materials chat how Hs behaves in your alloy system, what it does to weldability, and which grades to look at — with the source of every number named.