Killstreak And Flight

Radium is a chemical element. The symbol for radium is Ra, and its atomic number is 88. It was discovered by Marie Curie and Pierre Curie in the form of radium chloride in 1898. It is a slivery-white alkaline earth metal, but it turns black quickly when it is exposed to nitrogen in the air. All isotopes of radium are radioactive. The radioactivity of radium causes it to glow in the dark.