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Radium
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| Ra | 88 | 226 | 700 °C | 1737 °C | Solid | 5.5 g/cm3 | Alkaline Earth Metal   |
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| General |
| Name, Symbol, Number |
radium, Ra, 88 |
| Chemical series |
alkaline earth metals |
| Group, Period, Block |
2, 7, s |
| Appearance |
silvery white metallic |
| Standard atomic weight |
(226) g·mol−1 |
| Electron configuration |
[Rn] 7s2 |
| Electrons per shell |
2, 8, 18, 32, 18, 8, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
5.5 g·cm−3 |
| Melting point |
973 K
(700 °C, 1292 °F) |
| Boiling point |
2010 K
(1737 °C, 3159 °F) |
| Heat of fusion |
8.5 kJ·mol−1 |
| Heat of vaporization |
113 kJ·mol−1 |
Vapor pressure
| P(Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T(K) |
819 |
906 |
1037 |
1209 |
1446 |
1799 |
|
| Atomic properties |
| Crystal structure |
cubic body centered |
| Oxidation states |
2
(strongly basic oxide) |
| Electronegativity |
0.9 (scale Pauling) |
| Ionization energies |
1st: 509.3 kJ/mol |
| 2nd: 979.0 kJ/mol |
| Atomic radius |
215 pm |
| Miscellaneous |
| Magnetic ordering |
nonmagnetic |
| Electrical resistivity |
(20 °C) 1 µ Ω·m |
| Thermal conductivity |
(300 K) 18.6 W·m−1·K−1 |
| CAS registry number |
7440-14-4 |
| Selected isotopes |
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| References |
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Radium Compounds
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Source: Wikipedia article Radium
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Chemistry Quick Facts