NO. 109Unknown

Mt

Meitnerium

Meitnerium is a superheavy synthetic element with extremely limited experimental data due to its very short half-life.

Crystal Structure

Hexagonal close-packed (predicted)

Atomic Mass278 u

Density22 g/cm³

Melting Point2600 K

Boiling Point4600 K

Atomic Radius129 pm

Electronegativity1.3

Ionization Energy630 kJ/mol

Electron Affinity0 kJ/mol

Bonding TypeMetallic

Oxidation States3

Acid/BaseUnknown

ReactivityUnknown

Electron Configuration

[Rn] 5f14 6d7 7s2

Discovered ByGSI Darmstadt

Year1982

Known Isotopes

Mt-278