Marie Curie Kept Vials of Radium in Her Pocket and on Her Nightstand Because She Liked How They Glowed.
Radium is a chemical element with the atomic number 88 and the symbol Ra. It is the sixth element in Periodic Group 2, also known as alkaline earth metals. Pure radium is silvery-white, but when exposed to air, it readily reacts with nitrogen, forming a black surface layer of radium nitride. Radium isotopes are all […]