Radium adolah unsua kimia nan banomor atom 88 dan basimbol Ra. Unsua iko murninyo warnanyo putiah kaperakan, tapi mudah bareaksi jo nitrogen di udaro bebas, mambantuak lapisan radium nitrida (Ra3N2) nan warnanyo ungu kahitaman di permukannyo. Kasado isotop radium basifek sangat radioaktif, nan paliang stabil iolah radium-226 nan mamiliki waktu paruah 1600 tahun dan maluruah manjadi gas radon. Katiko radium maluruah, salah satu hasilnyo adolah radiasi pangion, nan dapek mambuek sanyawo fluoresens bacahayo dan mamicu efek cahayo radioluminesens.
Radium dalam sanyawo radium klorida ditamuan oleh Marie Curie dan Pierre Curie di tahun 1898.
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