| From Wikipedia, the free encyclopediaHassium is a chemical element with symbol Hs and atomic number 108, named after the German state of Hesse. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, 269Hs, has a half-life of approximately 9.7 seconds, although an unconfirmed metastable state, 277mHs, may have a longer half-life of about 130 seconds. More than 100 atoms of hassium have been synthesized to date. | |||
Hassium in the periodic table | |||
|---|---|---|---|
| Symbol | Hs | ||
| Atomic number | 108 | ||
| Group | 8 | ||
| Period | 7 | ||
| Block | d | ||
| Element category | Transition Metal | ||
Physical properties | |||
| Phase at STP | Solid | ||
| Density | 40.7 g/cm3 | ||
| Atomic weight | 269 u | ||
| Melting point | 126 K -147.15 °C -232.87 °F | ||
| Boiling point | K °C °F | ||
Atomära egenskaper | |||
| Electronegativity (Pauling Scale) | |||
| Electron affinity | kJ/mol | ||
| Ionization energies |
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Electron configuration | |||
| Electron configuration | 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d6 7s2 | ||
| Electrons per shell | 2, 8, 18, 32, 32, 14, 2 | ||
History | |||
| Discovered | 1984 | ||
| Discovered by | Gesellschaft für Schwerionenforschung | ||