A radioactive metallic chemical element, atomic number 89, found in small quantities in uranium ores such as pitchblende. Symbol Ac.
| 单词 | θ68872 |
| 释义 | the world > matter > chemistry > elements and compounds > metals > specific elements > actinium > [noun] (3) actinium1900 A radioactive metallic chemical element, atomic number 89, found in small quantities in uranium ores such as pitchblende. Symbol Ac. Ac1905 The element actinium (actinium, n. 2). Subcategories:— or higher atomic number (1) |
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