88Ra
Radium
Alkaline Earth MetalRadium (Ra) is element 88, an alkaline earth metal, in period 7 and group 2 of the periodic table. Its atomic mass is usually given as 226, it melts at 696 °C and boils at 1500 °C. Discovered by Marie Curie, 1898.
Atomic Number88
SymbolRa
NameRadium
Atomic Weight226 u
CategoryAlkaline Earth Metal
Period7
Group2
Melting Point696 °C
Boiling Point1500 °C
Density5.5 g/cm³
Electron Config[Rn] 7s2
Discovered ByMarie Curie, 1898