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Preferred Label : francium;

RADLEX synonyms : Fr;

Definition : 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. [MeSH];

UMLS CUI (RADLEX) : C0016678;

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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. [MeSH]

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30/07/2025


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