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atomic number 47
atomic number 48
atomic number 49
atomic number 5
atomic number 50
atomic number 51
atomic number 52
atomic number 53
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atomic number 60
-- atomic number 61 --
atomic number 62
atomic number 63
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atomic number 69
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atomic number 61

Noun1.atomic number 61 - 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
Synonyms: promethium, Pm
metal, metallic element, Pm, promethium

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