Commodity Code


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. more like this
notation more like this
Pm more like this
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broader lree
narrower promethium
in scheme commodity code
is primary topic of promethium