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francium

[ fran-see-uhm ]

noun

, Chemistry.
  1. a radioactive element of the alkali metal group. : Fr; : 87.


francium

/ 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
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


francium

/ frănsē-əm /

  1. 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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Word History and Origins

Origin of francium1

1945–50; after France where first identified; -ium
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Word History and Origins

Origin of francium1

C20: from New Latin, from France + -ium ; so-called because first found in France
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Example Sentences

The last of the original 92 elements to be discovered was element 87, francium.

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Francis Xavierfrancize