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Atomic Number	98

Atomic Symbol	Cf

Atomic Weight	[251 amu]

Group	Rare Earth (Actinide Series)

Form	Solid

Density @ STP	15.1 g/cm³

Melting Point	900 °C (1652 °F, 1173.15 °K)

First Ionization Potential	6.30 eV

Ground State Electron Configuration	5f¹⁰ 6s² 6p⁶ 6f²

Oxidation State(s)	+3

Selected Radioisotopes	²⁵²Cf

Crystal Structure	Hexagonal

Discovered by	Thompson; Street; Ghioroso; Seaborg, 1950