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francium |
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francium [ˈfrænsɪəm] n (Chemistry / Elements & Compounds) an unstable radioactive element of the alkali-metal group, occurring in minute amounts in uranium ores. Symbol: Fr; atomic no.: 87; half-life of most stable isotope, 223Fr: 22 minutes; valency: 1; melting pt.: 27°C; boiling pt.: 677°C [from New Latin, from France + -ium; so-called because first found in France]
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