Hassium (symbol Hs, atomic number 108) is a synthetic superheavy element named after the German state of Hesse. It is classified as a transition metal and sits in group 8, period 7 of the periodic table.
Overview
Hassium is the chemical element with atomic number 108 and the symbol Hs. With a standard atomic weight of [269], it is a transition metal. In the periodic table it occupies group 8 and period 7, and under standard conditions it is normally a solid. Hassium is a synthetic superheavy element named after the German state of Hesse.
Atomic structure
An atom of Hassium has 108 protons in its nucleus and, when neutral, 108 electrons arranged in the configuration [Rn] 5f14 6d6 7s2. Hassium has no stable isotope; the value [269] refers to the mass number of its most stable or most commonly produced isotope.
Discovery and place in the table
Hassium was discovered in 1984 by Gesellschaft für Schwerionenforschung. It follows Bohrium (Bh) and precedes Meitnerium (Mt) in order of atomic number.
| Atomic number | 108 |
|---|---|
| Symbol | Hs |
| Atomic mass | [269] |
| Category | Transition metal |
| Group | 8 |
| Period | 7 |
| Electron configuration | [Rn] 5f14 6d6 7s2 |
| Phase at STP | Solid |
| Discovered | 1984 (Gesellschaft für Schwerionenforschung) |