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... holmium [Lat.,=Stockholm], metallic chemical element; symbol Ho; at. no. 67; at. wt. 164.9304; m.p. about 1,474øC; b.p. about 2,425øC; sp. gr. 8.78 at 25øC; valence +3.Holmium is a soft, malleable, lustrous, silvery metal of the lanthanide series in Group 3 of the periodic table ...
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