Ra
88 alkaline earth metal Generado con IA
Radio
Symbol Ra
Atomic Mass 226
Radium is a chemical element with symbol Ra and atomic number 88. It is the sixth element in group 2 of the periodic table, also known as the alkaline earth metals. Pure radium is almost colorless, but it readily combines with nitrogen (rather than oxygen) on exposure to air, forming a black surface layer of radium nitride (Ra3N2).
Properties
- Phase: Solid
- Density: 5.5 g/cm³
- Melting Point: 1233 K
- Boiling Point: 2010 K