109Mt278.000

Meitnerium

unknown, probably transition metal

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.

Phase: Solid

2, 8, 18, 32, 32, 15, 2

Physical Properties

Atomic Mass278 u

Density37.4 g/cm³

Period7

PhaseSolid

Chemical Properties

Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d7

Semantic Config*[Rn] 5f14 6d7 7s2

Shells2, 8, 18, 32, 32, 15, 2

Discovery

Discovered byGesellschaft für Schwerionenforschung

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