NO. 101Actinide

Md

Mendelevium

Mendelevium is a synthetic actinide produced in particle accelerators. It exists only in trace amounts and is used solely for advanced nuclear research.

Crystal Structure

Hexagonal close-packed (predicted)

Technical Specifications

Atomic Mass258 u

Density10.3 g/cm³

Melting Point1100 K

Boiling Point1100 K

Atomic Radius188 pm

Electronegativity1.3

Ionization Energy635 kJ/mol

Electron Affinity0 kJ/mol

Bonding TypeMetallic

Oxidation States2, 3

Acid/BaseBasic

ReactivityHigh

Electron Configuration

[Rn] 5f13 7s2

Discovered ByLawrence Berkeley Lab

Year1955

Known Isotopes

Md-258