different between lanthanide vs lanthanum

English

Pronunciation

• enPR: l?n'th?n?d, IPA^(key): /?læn??na?d/

Noun

lanthanide (plural lanthanides)

1. (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

• 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

See also

• cerium
• praseodymium
• neodymium
• promethium
• samarium
• europium
• gadolinium
• terbium
• dysprosium
• holmium
• erbium
• thulium
• ytterbium
• lutetium

English

Alternative forms

• lantanium (obsolete)
• lanthanium (obsolete)

Etymology

From Ancient Greek ??????? (lanthán?, “to escape notice”) +? -um (“a chemical element”), because it had gone long undetected in mineral ores.

Pronunciation

• enPR: l?n'th?n?m, IPA^(key): /?læn??n?m/

Noun

lanthanum (countable and uncountable, plural lanthanums)

1. (uncountable) A chemical element (symbol La) with an atomic number of 57: a soft, ductile, silvery-white metal that tarnishes slowly when exposed to air.
2. (countable) An atom of this element.

Synonyms

• La

Derived terms

Related terms

Translations

See also

• Fosrenol
• rare earth

Latin

Pronunciation

• (Classical) IPA^(key): /?lan.t?a.num/, [???än?t??än???]
• (Ecclesiastical) IPA^(key): /?lan.ta.num/, [?l?n?t??num]

Noun

lanthanum n (genitive lanthan?); second declension

1. lanthanum

Declension

Second-declension noun (neuter).

Limburgish

Pronunciation

• IPA^(key): [l??n?ða??n??m]

Noun

lanthanum n

1. (uncountable) lanthanum
2. A part of lanthanum

Inflection