Terbium

Atomic number

65

Atomic mass (u)

158.92535

Category

Lanthanide

Standard state

Solid

Melting point

1355.85 °C (1629 K)

Boiling point

3229.85 °C (3503 K)

Density (g/cm³)

8.23

Electronegativity (Pauling)

Not reported in this source

Electron configuration

[Xe]6s2 4f9

Oxidation states

+3

Atomic radius (pm)

221

First ionization energy (eV)

5.864

Discovery & recognition

Discovery year / period (PubChem)

1843

Discovery credited to (RSC)

Carl Gustav Mosander

Date or period recorded by RSC

1843

Discovery place

Stockholm, Sweden

An ancient date does not identify a first human discovery. Different references may date observation, isolation and formal recognition differently.

Natural occurrence & production

The creation of an element’s nuclei and its concentration into terrestrial deposits are different processes. The occurrence note below concerns its presence or production on Earth; it is not a complete account of nucleosynthesis.

“Terbium can be recovered from the minerals monazite and bastnaesite by ion exchange and solvent extraction.”

Royal Society of Chemistry · occurrence excerpt ↗

Continue the research

Reference values are not product specifications. Blank values have not been estimated. For superheavy elements, some properties and family assignments are theoretical or incompletely measured.