1. 108
Hassio –
Hassium
Mass: 269 u
1s2
2s2
2p6
3s2
3p6 4s2
3d10
4p6
5s2
4d10
5p6
6s2
4f14
5d10
6p6
7s2
5f14
6d6
Melting point: ? K
Boiling point: ? K
Density: 41 g/cm3
Discovery: 1984
Hassium is a chemical element with symbol Hs and atomic number
108, named in honor of 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.