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1. (n.) francium
a radioactive element of the alkali metal group.
Etymology: (< F (1946), after France ; see -ium2)
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| Definition of 'Francium' |
Princeton's WordNet |
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1. (noun) francium, Fr, atomic number 87
a radioactive element of the alkali-metal group discovered as a disintegration product of actinium
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| Definition of 'Francium' |
U.S. National Library of Medicine |
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1. Francium
Francium. A radioactive alkali metal with the atomic symbol Fr, atomic number 87, and atomic weight 223. The mass numbers of other known isotopes are 204-213, 217-222, and 224. Its valence is +1.
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Definitions of Francium 
