The periodic Table
coloured by Discovery
coloured by States
Constants, Astronomy
Constants, Physics
SI Units
by Peder Axensten

Ra


in WebElements
in X-Ray info 		Ra, 88
radium (English)
radium, m. (French)
Radium, n. (German)
radij (Russian)
radium (Swedish)

Symbol, numberRa, 88 (alkaline earth metal), Group: 2; 2A
Weight226.0254
In Nature
Discovered1898, by Pierre and Marie Curie (France)
Density  [kg/m3]5000 [293 K] (solid)   
Molar volume45.2 cm3
Melting Temperature973 K   (700 °C)   Enthalpy: 136.8 kJ/mol
Boiling Temperature1413 K   (1140 °C)   Enthalpy: 7.15 kJ/mol
Electrical resistance100E-8 [273 K] Wm
ThermalConductivity: 18.6 [300 K] (calc.) W/Km     Expansion: 20.2E-6 /K
Ionisation [kJ/mol]
  M-->  M+--> M2+--> M3+--> M4+--> M5+--> M6+--> M7+--> M8+--> M9+-->M10+
Thermodynamics
State DfH° DfG° S° CpH H°298.15-H°0
[kJ/mol] [J/Kmol] [kJ/mol]
Isotopes
Mass In nature Half-life Spin m/mN NMM Decay
Ra