NO. 065Lanthanide

Tb

Terbium

Terbium is a rare earth metal used in green phosphors and solid-state devices.

Crystal Structure

Hexagonal close-packed (hcp)

Atomic Mass158.93 u

Density8.23 g/cm³

Melting Point1629 K

Boiling Point3503 K

Atomic Radius177 pm

Electronegativity1.1

Ionization Energy565 kJ/mol

Electron Affinity50 kJ/mol

Bonding TypeMetallic

Oxidation States3

Acid/BaseBasic

ReactivityHigh

Electron Configuration

[Xe] 4f9 6s2

Discovered ByCarl Gustaf Mosander

Year1843

Known Isotopes

Tb-159