109
Mt
278
Meitnerium
Element 109 · 278 u · d-block
unknown
Named after Lise Meitner, who co-discovered nuclear fission. One of the least studied elements.
Phase (STP)
Solid
Melting Point
—
Boiling Point
—
Density
37.4 g/cm³
Electronegativity
—
Atomic Radius
—
Ionization Energy
—
Electron Affinity
—
Discovered
1982 · Peter Armbruster
Electron Configuration
[Rn] 5f14 6d7 7s2
Electron Orbitals
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