Radium

Metal

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

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Ba

Fr				Ac

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Electronic 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: --

Thermal data

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

Steric data

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

Nuclide	Mass	Spin	Halflife	Decay mode	Decay tree
²²²Ra	222	0	38.0s	α	View
²²³Ra	223.019	1/2	11.435d	α	View
²²⁴Ra	224.02	0	3.66d	α	View
²²⁵Ra	225	1/2	14.9d	β-	View
²²⁶Ra	226.025	0	1.6E03y	α	View
²²⁸Ra	228	0	5.76y	β-	View

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.

Radium

Physical data

Electronic data

Thermal data

Steric data

Isotopes

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