Francium
A radioactive alkali metal with the atomic symbol Fr, and atomic number 87. The mass numbers of known isotopes are 204-213, 217-224. Its valence is +1.
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Subheadings:
Tree Number(s): D01.268.271.380, D01.268.549.250, D01.268.556.277, D01.496.749.305.380, D01.552.528.328, D01.552.544.277
MeSH Unique ID: D005605
Registry Number: 15TEQ7D2QF