Definition of lanthanium. Meaning of lanthanium. Synonyms of lanthanium
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Definition of lanthanium
lanthanium Lanthanum Lan"tha*num, n. [NL., fr. Gr. ? to lie hid, to be
concealed.] (Chem.)
A rare element of the group of the earth metals, allied to
aluminium. It occurs in certain rare minerals, as cerite,
gadolinite, orthite, etc., and was so named from the
difficulty of separating it from cerium, didymium, and other
rare elements with which it is usually associated. Atomic
weight 138.5. Symbol La. [Formerly written also
lanthanium.]
- Lanthanum is a chemical element; it has symbol La and atomic number 57. It is a soft, ductile, silvery-white metal that tarnishesslowly when exposed to... - and Earnshaw, pp. 1248–9 Mosander, C. G. (1843). "On the new metals, Lanthanium and Didymium, which are ****ociated with Cerium; and on Erbium and Terbium...
