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The Epic Interactive Encyclopedia 1997
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The_Epic_Interactive_Encyclopedia_97.iso
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francium
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1992-09-03
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A metallic element, symbol Fr, atomic number
87, relative atomic mass 223. It is a highly
radioactive metal; the most stable isotope
has a half-life of only 21 minutes. Francium
was discovered by Marguerite Perey (1909-)
1939.