请输入您要查询的英文单词:

 

单词 neptunium
释义
nep·tu·ni·um (nĕp-tnē-əm, -ty-)
n. Symbol 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 Periodic Table.

[After the planet NEPTUNE (from the fact that it follows uranium in the periodic table).]
随便看

 

英语词典包含135693条英英释义在线翻译词条,基本涵盖了全部常用单词的英英翻译及用法,是英语学习的有利工具。

 

Copyright © 2004-2022 Newdu.com All Rights Reserved
更新时间:2025/3/22 20:26:24