Because radium is a decay product of uranium or thorium.
Radium is a natural chemical element, solid, alkaline earth metal.
Radium is a natural chemical element, discovered in 1898, radioactive, alkaline earths group, metal, solid, rare in the nature.
No, radium is an alkaline earth metal .
Radium is an alkaline earth metal.
Radium is a solid alkaline earth metal.
Radium is in the alkaline earth metals.
Radium
Radium (Ra), atomic number 88, is the most reactive alkaline earth metal. It has the most energy levels of all the alkaline earth metals therefore it's electrons are more easily taken away.
Radium
Radium
Radium
Radium.