Radium has a atomic mass of 226 u, it's periodic number is 88. Radium is in group 2, period 7. It's group name is Alkaline Earth Metal. Radiums state of matter is solid at room temperature. Radium is a metal.
Three uses of radium
Radium had been used to make self-luminous paints for watches.
Radium has been used in aircraft instrumental dials.
Radium has been also used as a night light, because of the luminous glow.