Meitnerium (Mt)

From Wikipedia, the free encyclopediaMeitnerium is a chemical element with symbol Mt and atomic number 109. It is an extremely radioactive synthetic element (an element not found in nature that can be created in a laboratory). The most stable known isotope, meitnerium-278, has a half-life of 7.6 seconds.

Meitnerium in the periodic table

SymbolMt
Atomic number109
Group9
Period7
Blockd
Element categoryUnknown

Physical properties

Phase at STPSolid
Density37.4 g/cm3
Atomic weight278 u
Melting point K
°C
°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 6d7 7s2
Electrons per shell2, 8, 18, 32, 32, 15, 2

History

Discovered1982
Discovered byGesellschaft für Schwerionenforschung