Californium

Actinide · 251.07959 u · group 3, period 7

Californium · Cf

Atomic number98

SymbolCf

CategoryActinide

Standard stateSolid

Group · Period · Block3 · 7 · f

Electron configuration[Rn]7s2 5f10

Atomic mass251.07959 u

Atomic radius245 pm

Protons / Neutrons / Electrons98 / 153 / 98

Shells (e⁻ per shell)2, 8, 18, 32, 28, 8, 2

Electronegativity (Pauling)1.3

Ionization energy6.3 eV

Electron affinity—

Oxidation states+3

Melting point1.17e+3 K · 899.9 °C

Boiling point—

Density—

Year discovered1950

CPK color

#A136D4

State at room temp (25 °C)

solid

Position