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francium

Who discovered francium and when was it discovered?

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A color-coded periodic table of the elements displays each element's symbol and atomic number, with categories such as alkali metals, noble gases, halogens, transition metals, and actinoid elements distinguished by different background colors. — alkali metal Modern version of the periodic table of the elements (printable).

Francium was discovered by the French chemist Marguerite Perey in 1939. She identified the element while studying the decay of actinium-227.1