SHEET /m/francium · PubChem CID 6328145 · CAS 7440-73-5 · REV 2026.07
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Francium
from sourceFr · 223.01973 g/mol
eka-cesium · catium · eka-caesium · Element-Fr
What is Francium?
The rarest naturally occurring element after astatine: at most a few tens of grams exist in the entire earth's crust at any moment. Element 87. from source
CategoryElement & material
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Fig. 1 · 2D structure RDKit
SMILES
[Fr]Where you'll find it
A pure element or an engineered material, rather than an ingredient in a product. See the rest of the element & material group.