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holmium (Ho)

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Holmium (Ho) is a metallic element of the lanthanide series, first identified spectroscopically in 1878 by P. T. Cleve in Uppsala, Sweden, and independently by M. Delafontaine and J. L. Soret in Geneva. Its chief ore is monazite (a phosphate). Alloys of holmium are in used in magnets but the element has few commercial uses. Its most common isotope is 165Ho (100%).

atomic number 67
relative atomic mass 164.93
relative density 8.803
melting point 1,470°C (2,680°F)
boiling point 2,720°C (4,930°F)

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