What is PROMETHIUM?
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What is PROMETHIUM?
What is PROMETHIUM? Promethium is a chemical element with symbol Pm and atomic number 61. All of its isotopes are radioactive; it is extremely rare, with only about 500 to 600 grams naturally occurring in Earth's crust at any given time, and one of only two such elements that are followed in the periodic table by elements with stable forms, a ...
4.5K viewsNov 8, 2018
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