88
226 u
Ra
Radium
Alkaline Earth Metal
Atomic Structure
Physical State
Group
2
Period
7
Block
s
Electron Configuration
[Rn] 7s²
Physical Properties
Atomic Mass:
226 u
Electronegativity:
0.9
Atomic Radius:
223 pm
Ionization Energy:
5.279 eV
Density:
5.5 g/cm³
Melting Point:
973 K
Boiling Point:
2010 K
Historical Information
Discovered By:
Marie Curie
Year Discovered:
1898