atomic number 61
Noun 1. 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 (synonym) promethium, Pm (hypernym) metallic element, metal | ||||
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Atomic number 61 Definition from Language, Idioms & Slang Dictionaries & Glossaries
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atomic number 61
atomic number 61
n : 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 [syn: promethium, pm]
atomic number 61
n : 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 [syn: promethium, pm]