Radium
Ra
Radium
Alkali Earth Metal
Atomic number:
88
Atomic weight:
(266.0254)
Shells:
2,8,18,32,18,8,2
Orbitals:
[Rn 7s2
Melting point:
700°C
Boiling point:
1140°C
Covalent radius:
--
Å
Atomic volume:
45.20
cm³/mol
Atomic radius:
--
Å
Ionic radius:
1.62 (+2)
Å
Electronegativity:
0.9
Oxidation states:
1st ionization pot.:
5.2789
V
2nd ionization pot.:
10.148
V
3rd ionization pot.:
--
V
Specific heat:
0.12
J/gK
Heat of fusion:
--
kJ/mol
Heat of vapor.:
--
kJ/mol
Thermal conduct.:
0.186
W/cmK
Electrical conduct.:
--
10^6/cm ohm
Density:
5
g/cm³
Valence:
2
