English
Noun
wikipedia
en-noun
- chemistry any of the 14 rare earth elements from cerium (or from lanthanum) to lutetium in the periodic table; because their outermost orbitals are empty, they have very similar chemistry; below them are the actinides
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
rfc-level|Synonyms at L4+ not in L3 POS section
lanthanate (obsolete)
lanthanoid (including lanthanum)
lanthanon (proposed to avoid confusion with the usual meaning in chemistry of -ide)
rare-earth element
Derived terms
lanthanide contraction
lanthanide series
Translations
Croatian: t-|hr|lantanoid|m
Italian: t-|it|lantanide|m
mid
See also
cerium
praseodymium
neodymium
promethium
samarium
europium
gadolinium
terbium
dysprosium
holmium
erbium
thulium
ytterbium
lutetium
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