francium
[ fran-see-uhm ]
/ ˈfræn si əm /
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noun Chemistry.
a radioactive element of the alkali metal group. Symbol: Fr; atomic number: 87.
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Words nearby francium
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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2021
Example sentences from the Web for francium
The last of the original 92 elements to be discovered was element 87, francium.
British Dictionary definitions for francium
francium
/ (ˈfrænsɪəm) /
noun
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, 223 Fr: 22 minutes; valency: 1; melting pt: 27°C; boiling pt: 677°C
Word Origin for francium
C20: from New Latin, from France + -ium; so-called because first found in France
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Medical definitions for francium
francium
[ frăn′sē-əm ]
n. Symbol Fr
An extremely unstable radioactive element of the alkali metals, having approximately 19 isotopes, the most stable of which is Fr 223 with a half-life of 21 minutes. Atomic number 87.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Scientific definitions for francium
francium
[ frăn′sē-əm ]
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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