Berkelium

Actinide · 247.07031 u · group 3, period 7

Berkelium · Bk

Atomic number97

SymbolBk

CategoryActinide

Standard stateSolid

Group · Period · Block3 · 7 · f

Electron configuration[Rn]7s2 5f9

Atomic mass247.07031 u

Atomic radius244 pm

Protons / Neutrons / Electrons97 / 150 / 97

Shells (e⁻ per shell)2, 8, 18, 32, 27, 8, 2

Electronegativity (Pauling)1.3

Ionization energy6.23 eV

Electron affinity—

Oxidation states+4, +3

Melting point1.32e+3 K · 1.05e+3 °C

Boiling point—

Density14 g/cm³

Year discovered1949

CPK color

#8A4FE3

State at room temp (25 °C)

solid

Position