Bohrium Meitnerium

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

Symbol

Atomic number

108

Group

Period

Block

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

Atomic properties

Electronegativity (Pauling Scale)

Electron affinity

kJ/mol

Oxidation states

(+2), (+3), (+4), (+6), +8
(prediction)

Ionization energies

1	733.3 kJ/mol
2	1756.0 kJ/mol
3	2827.0 kJ/mol
4	3637.5 kJ/mol
5	4940.0 kJ/mol
6	6175.1 kJ/mol
7	7535.5 kJ/mol
8	8857.4 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)

[Rn] 5f¹⁴ 6d⁶ 7s²

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