| 释义 |
nep·tu·ni·um AHD[nĕp-to͞o′nē-əm, -tyo͞o′-] D.J.[nepˈtuːniːəm, -ˈtjuː-]K.K.[nɛpˈtuniəm, -ˈtju-]n.Symbol Np （名词）符号 Np - A silvery, metallic, naturally radioactive element, atomic number 93, the first of the transuranium elements. Its longest-lived isotope is Np-237 with a half-life of 2.1 million years. Found in trace quantities in uranium ores, it is produced synthetically by nuclear reactions. See table at element 镎：一种银白色的、金属性天然放射性元素，原子序数为93，第一个超铀元素。其周期最长的同位素为Np-237，半衰期为210万年。见于铀矿的示踪量中，由核反应合成生产出来 参见 element
- After the planet Neptune 1 [from the fact that it follows uranium in the periodic table] 源自 Neptune1 [来自于在周期表里，从它位于铀元素之后的事实]
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