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;
Origin ID : RID11934;
UMLS CUI : C0016678;
Semantic type(s)
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]
