Terbium - ASCII Periodic Table of the Elements

ASCII PERIODIC TABLE OF THE ELEMENTS

  Tb

Relative atomic mass: 158.92535 ± 0.00002

English: Terbium
French: Terbium
Croatian: Terbij
German: Terbium
Italian: Terbio
Spanish: Terbio

Atomic number: 65
Group numbers: 3
Period: 6
Standard state (20 °C): solid

Discovery: 1843 Carl Gustav Mosander (SE)

Terbium was discovered by Carl Gustaf Mosander (SE) in 1843. Named after 'Ytterby', a village in Sweden. It is a soft, ductile, silvery-grey, rare earth metal that oxidizes slowly in air and reacts with cold water. Terbium is found with other rare earths in monazite sand. Other sources are xenotime and euxenite, both of which are oxide mixtures that can contain up to 1% terbium. It is used in modest amounts in special lasers and solid-state devices.

Electronic configuration: [Xe] 4f⁹ 6s²
Formal oxidation number: +3
Atomic radius: 176.3 pm

Electronegativities: -
Thermal conductivity: 11.1 W/(m K)
Electrical resistivity (20 °C): 116 μΩcm

Melting point: 1356 °C
Boiling point: 3230 °C

Heat of fusion: 16.3 kJ/mol
Heat of vaporization: 391 kJ/mol
Heat of atomization: 390.62 kJ/mol