Electronic data		Thermal data		Steric data
Shells: 2,8,18,32,18,8,2 Orbitals: [Rn] 7s2 Electronegativity: 1.0, 0.9 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 () Covalent radius: -- Å Atomic volume: 45.20 cm³/mol Density (293 K): 5 g/cm³ Crystal structure: Cubic: Body centered

Legend     Pocket calculator

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

Legend

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.