The Periodic Table of Elements
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109
Mt
Meitnerium
Summary
Meitnerium 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.
Block: d
Period: 7
Group: 9
Atomic Mass: 278 g/mol (amu)
Discovered By: Gesellschaft für Schwerionenforschung
Phase: Solid
Boiling Point: N/A
Melting Point: N/A
Type: transition metal
Density: 37.4 g/cm3
Electron Configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d7
Electron Configuration (Semantic): *[Rn] 5f14 6d7 7s2