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Bohrium - Hassium - Meitnerium

Full table
Known properties
Name, Symbol, NumberHassium, Hs, 108
Chemical series Transition metals
Group, Period, Block8, 7 , d
Appearance unknown; probably metallic,
silvery white or gray
Atomic weight [269] amu
Electron configuration probably [Rn] 5f14 6d6 7s2
a guess based osmium
e- 's per energy level2, 8, 18, 32, 32, 14, 2
State of matter Presumably a solid
Hassium is a chemical element in the periodic table that has the symbol Hs and atomic number 108. It is a synthetic element whose most stable isotope is Hs-265, with a half-life of 2 ms.


It was first synthesized in 1984 by a German research team led by Peter Armbruster and Gottfried Münzenberg at the Institute for Heavy Ion Research at Darmstadt. The name hassium was proposed by them, derived from the Latin name for the German state of Hessen where the institute is located.

There was an element naming controversy as to what the elements from 101 to 109 were to be called; thus IUPAC adopted unniloctium (symbol Uno) as a temporary name for this element. In 1994 a committee of IUPAC recommended that element 108 be named hahnium. The name hassium was adopted internationally, however, in 1997.

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