On April 20, 1902, Marie and Pierre Curie successfully
isolated radioactive radium salts from pitchblende, a mineral, in a
laboratory in Paris, France. Inspired by French physicist Henri Becquerel’s
1896 experiment on phosphorescence, or the phenomenon that allows certain
objects to glow in the dark, the Curries were able to find traces of two
radioactive elements—polonium (Element 84) and radium (Element 88).
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