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Radium

Chemical element
Radium is a chemical element; it has 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 silvery-white, but it readily reacts with nitrogen upon exposure... Wikipedia
Symbol: Ra
Discoverers: Marie Curie and Pierre Curie
Atomic number: 88
Atomic mass: 226 u
Discovered: December 21, 1898
Electron configuration: Rn 7s2
Melting point: 1,285°F (696°C)