Francium meaning

frănsē-əm
An extremely unstable radioactive element of the alkali metals, produced by alpha decay of actinium or artificially from thorium, having over 40 isotopes and isomers, the most stable of which is Fr-223 with a half-life of 22 minutes. Atomic number 87; melting point 27°C; boiling point 677°C; valence 1.
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A radioactive chemical element, an alkali metal, existing in minute amounts in nature as a decay product of actinium: symbol, Fr; at. no. 87
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An extremely unstable, radioactive element of the alkali group. It is the heaviest metal of the group. Francium occurs in nature, but less than 28.35 g (1 oz) is present in the Earth's crust at any time. It has approximately 19 isotopes, the most stable of which is Fr 223 with a half-life of 21 minutes. Atomic number 87; valence 1.
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A metallic chemical element (symbol Fr) with an atomic number of 87.
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Origin of francium

  • After France

    From American Heritage Dictionary of the English Language, 5th Edition

  • From French francium, from France +‎ -ium (after the native country of Marguerite Perey).

    From Wiktionary