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Radium - Ra
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Chemical properties of radium - Health effects of radium
- Environmental effects of radium
Atomic number
88
Atomic mass
226.0254 g.mol -1
Electronegativity
according to Pauling
0.9
Density
5 g.cm-3 at 20°C
Melting point
700 °C
Boiling point
1140 °C
Vanderwaals
radius
0.230 nm
Ionic radius
unknown
Isotopes
6
Electronic
shell
[ Rn ] 7s2
Energy of
first ionisation
509.1 kJ.mol -1
Energy of
second ionisation
975 kJ.mol -1
Discovered by
Pierre and Marie Curie 1898
