Conjectured the radiation emanated from single atoms, and deduced from her quantitative studies of the radioactivity of samples that there were present in coal and pitchblende other radioactive elements in addition to uranium; thus she discovered with P. Curie polonium, radioactive thorium, and other heretofore unknown radioactive elements including radium.
"New Radio-Active Element in Pitchblende," Comptes Rendus 127: 175 (1898) with P. Curie.
"Another New Radio-active Element," Comptes Rendus 127: 1215 (1898) with P. Curie and G. Bmont.
Darn that Trump for being President during the mass retirement of the baby boomers.