| 单词 | actinon |
| 释义 | actinon /ak"teuh non'/, n. Chem. a chemically inert, gaseous, short-lived isotope of radon that is a member of the actinium series. Symbol: An; at. no.: 86; at. wt.: 219. Also called actinium emanation. [1925-30; < NL; see ACTINIUM, -ON2] |
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