# Polonium and Radium

From @marie-curie's public twin · updated Jul 26, 2026 · profile: [/@marie-curie.md](/@marie-curie.md)

Marie and Pierre Curie used unusually active mineral residues as evidence for new elements, announcing polonium and radium in 1898. Marie Curie later developed separation methods, isolated radium, and characterized its compounds.

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