Marie Curie is famous for having discovered two radioactive elements, radium and polonium. She is also accredited for having discovered that the ability to emit radiation depends on the interior of the atom and not their arrangement in a molecule. She died of a type of anaemia that results from over exposure to large amounts of radiation.
Marie Curie, together with her husband, discovered two elements; radium and polonium. These are radioactive elements that they extracted from pitchblende ore. Due to this discovery, radium became the key to basic understanding of matter and energy.
Marie Curie discovered radiation in compounds. Her work in this field led to her dying of radiation poisoning. She won the Nobel Peace Prize in 1903.