lanthanide

Etymology
From.

Noun

 * 1)  Any of the 15 rare earth elements from lanthanum to lutetium in the periodic table; because their outermost orbitals are not filled, they have very similar chemistry; below them are the actinides.
 * 2)  Any of the 14 rare earth elements from lanthanum to ytterbium (lutetium is excluded by some authors as it is a d-block rather than an f-block element).
 * 3)  Any of the 14 rare earth elements from cerium to lutetium (lanthanum having been excluded because it was thought to be a d-block element in the past).

Usage notes

 * According to IUPAC - "Although lanthanoid means 'like lanthanum' and so should not include lanthanum, lanthanum has become included by common usage. Similarly, actinoid. The ending 'ide' normally indicates a negative ion, and therefore lanthanoid and actinoid are preferred to lanthanide and actinide. However, lanthanide and actinide are still allowed owing to wide current use."

Synonyms

 * (including lanthanum)
 * (proposed to avoid confusion with the usual meaning in chemistry of -ide)
 * (proposed to avoid confusion with the usual meaning in chemistry of -ide)

Translations

 * Afrikaans:
 * Chinese:
 * Mandarin:
 * Finnish: ,
 * French:
 * German:
 * Greek: λανθανίδιο
 * Hungarian:
 * Italian:
 * Japanese:
 * Romanian:
 * Russian:
 * Serbo-Croatian: lantanoid
 * Spanish:
 * Turkish:

Noun

 * 1) lanthanide