名詞 plutonium:

1. 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
   同義詞：Pu, atomic number 94

plu.to.ni.um

n.Symbol Pu （名詞）符號 Pu
A naturally radioactive, silvery, metallic transuranic element, occurring in uranium ores and produced artificially by neutron bombardment of uranium. Its longest-lived isotope is Pu 244 with a half-life of 7' million years. It is a radiological poison, specifically absorbed by bone marrow, and is used, especially the highly fissionable isotope Pu 239, as a reactor fuel and in nuclear weapons. Atomic number 94; melting point '40=C; boiling point 3,235=C; specific gravity 9.84; valence 3, 4, 5, '.See table at element
钚：一種天然地放射性銀色超鈾金屬元素，存在于鈾礦中，對鈾元素進行中子轟擊而人工制成。其存在周期最長的同位素是半衰期為七千六百萬年的鈽244，它是一種核輻射毒素，特別是能被骨髓吸收。尤其是其極具可裂變性的同位素鈽239，被用作一種核反應(yīng)燃料并用在核武器中。原子序數(shù)94；熔點'40=C；沸點3,235=C；比重9.84；化合價3, 4, 5, '參見 element

來源：
After the planet Pluto [from the fact that it follows neptunium in the periodic table]
源自 Pluto [源于該元素在元素周期表中排在錸之后這一事實]