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• atomic number 94, plutonium, pu
• プルトニウム
• a solid silvery grey radioactive transuranic element whose atoms can be split when bombarded with neutrons; found in minute quantities in uranium ores but is usually synthesized in nuclear reactors; 13 isotopes are known with the most important being plutonium 239
• 中性子によって砲撃されると原子を分けることができる固体の銀の灰色の放射性超ウラン元素