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This is Francium.

Symbol Fr
Atomic number 87
Atomic mass (223) amu

Francium, discovered in 1939, is formed in the natural radioactive decay of actinium and in nuclear reactions. All of its isotopes are radioactive with short half-lives. The graph to the right, which identifies francium by its radiation, is from the notebook of the discoverer, Margurerite Perey, who was an assistant to Marie Curie.

See also

Periodic table of the elements