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%).
|relative atomic mass