Hassium (Hs)

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

SymbolHs
Atomic number108
Group8
Period7
Blockd
Element categoryTransition Metal

Physical properties

Phase at STPSolid
Density40.7 g/cm3
Atomic weight269 u
Melting point126 K
-147.15 °C
-232.87 °F
Boiling point K
°C
°F

Atomära egenskaper

Electronegativity (Pauling Scale)
Electron affinity kJ/mol
Ionization energies
1 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d6 7s2
Electrons per shell2, 8, 18, 32, 32, 14, 2

History

Discovered1984
Discovered byGesellschaft für Schwerionenforschung