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Noun
1. plutonium (Pu)
Wikipedia definition
2. PlutoniumPlutonium is a transuranic radioactive chemical element with the chemical symbol Pu and atomic number 94. It is an actinide metal of silvery-gray appearance that tarnishes when exposed to air, forming a dull coating when oxidized. The element normally exhibits six allotropes and four oxidation states. It reacts with carbon, halogens, nitrogen and silicon.
Read “Plutonium” on English Wikipedia
Read “プルトニウム” on Japanese Wikipedia
Read “Plutonium” on DBpedia

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