| 单词 | actinium |
| 释义 | actinium /ak tin"ee euhm/, n. Chem. a radioactive silver-white metallic element that glows blue in the dark, resembling the rare earths in chemical behavior and valence. Symbol: Ac; at. no.: 89; at. wt.: 227. [1900-05; ACTIN- + -IUM] |
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