Overview |
Name | Radium |
Symbol | Ra |
Atomic Number | 88 |
Atomic Weight | 226[note] |
Density | 5 g/cm3 |
Melting Point | 700 °C |
Boiling Point | 1737 °C |
Thermal properties |
Phase | Solid |
Melting Point | 700 °C |
Boiling Point | 1737 °C |
Absolute Melting Point | 973 K |
Absolute Boiling Point | 2010 K |
Heat of Fusion | 8 kJ/mol |
Heat of Vaporization | 125 kJ/mol |
Heat of Combustion | N/A |
Specific Heat | 92 J/(kg K)[note] |
Thermal Conductivity | 19 W/(m K) |
Thermal Expansion | N/A |
Bulk physical properties |
Density | 5 g/cm3 |
Density (Liquid) | N/A |
Molar Volume | 0.0000452 |
Thermal Conductivity | 19 W/(m K) |
Thermal Expansion | N/A |
Reactivity |
Valence | 2 |
Electronegativity | 0.9 |
ElectronAffinity | N/A |
Ionization Energies | |
Health and Safety |
Autoignition Point | N/A |
Flashpoint | N/A |
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Classifications |
Alternate Names | None |
Nams of Allotropes | None |
Block | s |
Group | 2 |
Period | 7 |
Electron Configuration | [Rn]7s2 |
Color | Silver |
Discovery | |
Gas phase | N/A |
CAS Number | CAS7440-14-4 |
Electrical properties |
Electrical Type | Conductor |
Electrical Conductivity | 1×106 S/m |
Resistivity | 1×10-6 m Ω |
Superconducting Point | N/A |
Magnetic properties |
Magnetic Type | N/A |
Curie Point | N/A |
Mass Magnetic Susceptibility | N/A |
Molar Magnetic Susceptibility | N/A |
Volume Magnetic Susceptibility | N/A |
Abundances |
% in Universe | N/A |
% in Sun | N/A |
% in Meteorites | N/A |
% in Earth's Crust | 9.9×10-12% |
% in Oceans | 1×10-15% |
% in Humans | 1×10-13% |
Atomic dimensions and structure |
Atomic Radius | N/A |
Covalent Radius | N/A |
Van der Waals Radius | N/A |
Crystal Structure | Body Centered Cubic |
Lattice Angles | |
Lattice Constants | |
Space Group Name | Im_
3m |
Space Group Number | 229 |
Nuclear Properties |
Half-Life | 1.59×103 y |
Lifetime | 2.31×103 y |
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