curium (Cm) /kyo̅o̅″rē·əm/ [Marie S. Curie; Pierre Curie] , a radioactive metallic element. Its atomic number is 96. Its atomic mass is 247. Curium is an artificial element produced by bombarding plutonium with helium ions in a cyclotron. Numerous isotopes of curium are produced by bombarding lighter transuranium elements. The radioactivity of curium causes it to glow in the dark.
