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Atomic Number	94

Atomic Symbol	Pu

Atomic Weight	[244 amu]

Group	Rare Earth (Actinide Series)

Form	Solid

Density @ STP	19.7 g/cm³

Melting Point	640 °C (1184 °F, 913.15 °K)

Boiling Point	3228 °C (5842.4 °F, 3501.15 °K)

Heat of Fusion	2.82 kJ/mol

Heat of Vaporization	325 kJ/mol

First Ionization Potential	6.06 eV

Electronegativity (on Pauling scale	1.3

Ground State Electron Configuration	5f⁶ 6s² 6p⁶ 6f²

Oxidation State(s)	+3, +4, +5, +6

Selected Radioisotopes	²³⁸Pu, ²³⁹Pu, ²⁴¹Pu, ²⁴⁴Pu

Crystal Structure	Monoclinic

Discovered by	Seaborg; McMillan; Kennedy; Wahl, 1940