Radium

Radium
Chemical element
Radium is a radioactive chemical symbolized by the symbol Ra and its atomic number 88. It is almost pure white and is alkaline but easily oxidized when exposed to air, becoming black. Radiation decay results in radon.
Code: Ra
Date of discovery: 1898
Atomic number:88
Electronic Distribution: [Rn] 7s2
Atomic mass: 226 u
Finders: Marie Curie, Pierre Curie