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francium

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Pronunciation: fran′sē-ŭm
Radioactive element of the alkali metal series; atomic no. 87; half-life of most stable known isotope, 223Fr, is 21.8 min.

[France, native country of Marguerite Perey (1909–1975), the discoverer]

 

 

 

 

 

 

 

 

 

 

 






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