holmium

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holmium (symbol Ho) Metallic element of the lanthanide series (rare-earth metals), first identified spectroscopically in 1878 by Swiss chemists and in 1897 by Swedish chemist Per Cleve (1840–1905) who named it after the Latin name for Stockholm (Holmia). Its chief ore is monazite. The element has few commercial uses. Properties: at.no. 67; r.a.m. 164.9304; r.d. 8.795 (25°C); m.p. 1474°C (2685°F); b.p. 2695°C (4883°F); most common isotope Ho165 (100%).

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