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Radium

Metal radioactivesolid
Symbol: Ra
Atomic number: 88
Atomic mass: (226.0254)
Group: Alkali Earth Metal
CAS-number: 7440-14-4

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Physical data

Electronic dataThermal dataSteric data
Shells: 2, 8, 18, 32, 18, 8, 2
Orbitals: [Rn] 7s2
Electronegativity: 0.9, 1.0
1. Ionization potential: 5.2789 eV
2. Ionization potential: 10.148 eV
3. Ionization potential: -- eV
Oxidation states: 2
Electrical conductivity: --
Melting point: 700 °C
Boiling point: 1140 °C
Specific heat: 0.12 J/gK
Heat of fusion: -- kJ/mol
Heat of vaporization: -- kJ/mol
Thermal conductivity: 0.186 W/cmK
Atomic radius: -- Å
Ionic radius: 1.62 Å (+2)
Covalent radius: -- Å
Atomic volume: 45.20 cm³/mol
Density (293 K): 5 g/cm³
Crystal structure: cubic body centered
cubic body centered

Isotopes

NuclideAbundance [%]MassSpinHalflifeDecay modeDecay tree
222Ra 0 222 0 38.0s α View
223Ra 0 223.019 1/2 11.435d α View
224Ra 0 224.02 0 3.66d α View
225Ra 0 225 1/2 14.9d β- View
226Ra 0 226.025 0 1.6E03y α View
228Ra 0 228 0 5.76y β- View

Other info

Name origin:Latin: radius (ray).
Description:Silvery-white metal. Intensely radioactive.
Discovered by:Pierre and Marie Curie
Year:1898
Place:France
Sources:Found in uranium ores at 1 part per 3 million parts uranium.
Use(s):Used in treating cancer because of the gamma rays it gives off.