http://resource.geosciml.org/classifier/cgi/commodity-code/promethium
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definition | Promethium, originally prometheum, is a chemical element with the symbol Pm and atomic number 61. All of its isotopes are radioactive; it is one of only two such elements that are followed in the periodic table by elements with stable forms, a distinction shared with technetium. | ||||||
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source | http://en.wikipedia.org/wiki/Promethium | ||||||
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in scheme | commodity-code original |