Relative atomic mass: 167.259 +- 0.003

English: Erbium
French: Erbium
Croatian: Erbij
German: Erbium
Italian: Erbio
Spanish: Erbio

Atomic number: 68
Group numbers: 3
Period: 6
Standard state (20 oC): solid

Discovery: 1843 Carl Gustav Mosander (SE)
Erbium was discovered by Carl Gustaf Mosander (SE) in 1843. Named after Ytterby, a village in Sweden. It is a soft, malleable, silvery metal that reacts slowly with water and dissolves in acids. Metal ignites and burns readily. Erbium is found with other heavier rare earths in xenotime and euxenite. Erbium oxide is used in ceramics to obtain a pink glaze. There are also a few uses in the nuclear industry and as an alloying agent for other exotic metals. The price of 99.9 % pure erbium pieces is 232.60 for 50 g.
Electronic configuration: [Xe] 4f12 6s2
Formal oxidation number: +3
Atomic radius: 173.4 pm

Electronegativities: 1.24
Thermal conductivity: 14.3 W/(m K)
Electrical resistivity (20 oC): 107 microOhm cm

Melting point: 1529 oC
Boiling point: 2868 oC

Heat of fusion: 17.2 kJ/mol
Heat of vaporization: 280 kJ/mol
Heat of atomization: 318.32 kJ/mol

67Ho <= 68Er => 69Tm

ASCII Periodic Table of the Elements
6 Jan. 2020
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