holmium hol·mi·um (hōl'mē-əm)
A soft malleable rare-earth element. Atomic number 67; atomic weight 164.930; melting point 1,472°C; boiling point 2,700°C; specific gravity 8.80; valence 3.
|holmium (hōl'mē-əm) Pronunciation Key
A soft, silvery, malleable metallic element of the lanthanide series. Its compounds are highly magnetic. It is mainly used in scientific research but has also been used to make electronic devices. Atomic number 67; atomic weight 164.930; melting point 1,461°C; boiling point 2,600°C; specific gravity 8.803; valence 3. See Periodic Table.
(Ho), chemical element, rare-earth metal of the lanthanoid series of the periodic table, one of the most paramagnetic substances known. Among the least abundant of the rare-earth elements, holmium and its compounds have limited application except for research. Holmium has been used as a component of some electronic devices; the ion Ho3+ has been used as a catalyst for ortho-para hydrogen conversion; and the oxide has been used as a special refractory.
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