= francium, n.
| 单词 | θ68866 |
| 释义 | the world > matter > chemistry > elements and compounds > metals > specific elements > francium > [noun] (2) virginium1932 = francium, n. francium1946 A very rare, unstable, radioactive metallic element, atomic number 87, which is the heaviest member of the alkali-metal series and is chemically… |
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