Promethium (formerly prometheum, Pm) is a chemical element with atomic number (Z) 61, group n/a, period 6, and atomic mass number 145. The Promethium (Pm) is a Rare Earth Metal that emits beta radius and very radioactive. Promethium is not well defined the chemical and physical properties. (Refer to the Chemical Element; Periodic Table)
Promethium (formerly prometheum, Pm)
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