Radium is a chemical element. Its atomic number is 88 and it is denoted by the symbol Ra. It is pure white alkaline earth metal. In 1898, radium was discovered by Polish–French physicist–chemist Madame Marie Sklodowska Curie and a French physicist Pierre Curie.

Marie Curie won two Noble Prizes for her great works for chemistry and physics. She won the Noble prize for Physics in 1903 and for Chemistry in 1911. Pierre Curie also won the Noble Prize for his achievements in the field of Physics in 1903.