francium

fran·ci·um  (frns-m)

n. Symbol Fr

An extremely unstable radioactive element of the alkali metals, produced artificially from actinium or thorium, having approximately 19 isotopes, the most stable of which is Fr 223 with a half-life of 21 minutes. Atomic number 87; valence 1. See Table at element.

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[After France.]

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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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francium  (frns-m)

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.

Thesaurus

Noun

1.

francium - a radioactive element of the alkali-metal group discovered as a disintegration product of actinium atomic number 87, Fr metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.

Translations

francium [ˈfrænsɪəm] N → francio m