EXPLANATION: The correct answer is option 4 i.e., Marie Curie discovered Radium.​ S.No Scientist Name Discovered Information 1. James Chadwick Neutron In 1932, J. Chadwick discovered another subatomic particle that had no charge and a mass nearly equal to that of a proton. It was eventually named a neutron. Neutrons are present in the nucleus of all atoms, except hydrogen. 2. Albert Einstein Photoelectric Effect When the light of a sufficiently small wavelength is incident on a metal surface, electrons are ejected from the metal instantly. This phenomenon is called the photoelectric effect. 3. Marie Curie Radium The first woman to win a Nobel Prize was Marie Curie, who won the Nobel Prize in Physics in 1903 with her husband, Pierre Curie, and Henri Becquerel. Together with her husband, Pierre, she discovered radium, an element widely used for treating cancer, and studied uranium and other radioactive substances In 1911, she won the Nobel Prize in Chemistry for the isolation of radium.