| 单词 | neptunium |
| 释义 | neptunium /nep tooh"nee euhm, -tyooh"-/, n. Chem., Physics. a transuranic element produced in nuclear reactors by the neutron bombardment of U-238: decays rapidly to plutonium and then to U-235. Symbol: Np; at. no.: 93. [1940-45; NEPTUNE + -IUM] |
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