atomic number 61 meaning

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atomic number 61 (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.

Definition of atomic number 61

  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

    Synonyms: promethium, Pm

    Type of: metallic element

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