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 oC): 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. The price of 99.9 % pure terbium ingot is 266.30 for 10 g.
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 oC): 116 microOhm cm

Melting point: 1356 oC
Boiling point: 3230 oC

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

64Gd <= 65Tb => 66Dy

ASCII Periodic Table of the Elements
6 Jan. 2020
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