Terbium

Lanthanide · 158.92535 u · group 3, period 6

Terbium · Tb

Atomic number65

SymbolTb

CategoryLanthanide

Standard stateSolid

Group · Period · Block3 · 6 · f

Electron configuration[Xe]6s2 4f9

Atomic mass158.92535 u

Atomic radius221 pm

Protons / Neutrons / Electrons65 / 94 / 65

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

Electronegativity (Pauling)—

Ionization energy5.864 eV

Electron affinity—

Oxidation states+3

Melting point1.63e+3 K · 1.36e+3 °C

Boiling point3.50e+3 K · 3.23e+3 °C

Density8.23 g/cm³

Year discovered1843

CPK color

#30FFC7

State at room temp (25 °C)

solid

Position