different between promethium vs lanthanide

English

Alternative forms

• prometheum (formerly)

Etymology

1945. From the name of the Greek god Prometheus, who stole the fire from Mount Olympus and brought it down to mankind +? -ium.

Pronunciation

• enPR: pr?m?'th??m, IPA^(key): /p?o??mi??i?m/

Noun

promethium (uncountable)

1. A metallic chemical element (symbol Pm) with an atomic number of 61.

Synonyms

• (metallic element): (disused) cyclonium, (disused) florentium, (disused) illinium

Derived terms

• promethium chloride
• promethium nitrate

Related terms

• promethea
• promethean
• Prometheus

Translations

Danish

Noun

promethium

1. promethium

Dutch

Pronunciation

Noun

promethium n (uncountable)

1. promethium

Latin

Pronunciation

• (Classical) IPA^(key): /pro?me?.t?i.um/, [p???me?t??i???]
• (Ecclesiastical) IPA^(key): /pro?me.ti.um/, [p???m??t?ium]

Noun

prom?thium n (genitive prom?thi?); second declension

1. promethium

Declension

Second-declension noun (neuter).

Limburgish

Pronunciation

• IPA^(key): [p???me??ð???m]

Noun

promethium n

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

Inflection

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