PROMETHIUM

promethium, Pm, atomic number

(noun) a soft silvery metallic element of the rare earth group having no stable isotope; was discovered in radioactive form as a fission product of uranium

Source: WordNet® 3.1

Etymology

Noun

promethium (uncountable)

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

Synonyms

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

Source: Wiktionary

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