Francium
[fran-see-uh m] /ˈfræn si əm/
noun, Chemistry.
1.
a radioactive element of the alkali metal group. Symbol: Fr; atomic number: 87.
/ˈfrænsɪəm/
noun
1.
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
francium fran·ci·um (frān’sē-əm)
n.
Symbol Fr
An extremely unstable radioactive element of the alkali metals, having [approx] 19 isotopes, the most stable of which is Fr 223 with a half-life of 21 minutes. Atomic number 87; valence 1.
francium
(frān’sē-əm)
Symbol Fr
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. See Periodic Table.
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