Radium was discovered by Pierre and Marie Curie in 1898 in the ore Pitchblende after their discovery of polonium in the same ore. It is a solid metal at room temperature and it has a melting point of 700°c and a boiling point of 1140°c. Radium is a radioactive element an will decay quickly. It glows in the dark and also some of its compounds will as well. Radium is sometimes used in the production of glow in the dark paints but due to its toxicity is no longer used. Radium is not present in its elemental form in the earths crust but instead found in uranium deposits and in sea water. Radium compounds produce alpha, beta and gamma rays making them dangerous to humans.
Pierre and Marie Curie