NO. 094Actinide

Pu

Plutonium

Plutonium is a dense, radioactive actinide used in nuclear weapons and reactors. It has multiple allotropes and is extremely hazardous to handle.

Crystal Structure

Monoclinic

Atomic Mass244 u

Density19.8 g/cm³

Melting Point913 K

Boiling Point3505 K

Atomic Radius159 pm

Electronegativity1.28

Ionization Energy585 kJ/mol

Electron Affinity0 kJ/mol

Bonding TypeMetallic

Oxidation States3, 4, 5, 6

Acid/BaseBasic

ReactivityHigh

Electron Configuration

[Rn] 5f6 7s2

Discovered ByGlenn T. Seaborg

Year1940

Known Isotopes

Pu-239Pu-244