Technical data for Radium

Overview
NameRadium
SymbolRa
Atomic Number88
Atomic Weight226[note]
Density5 g/cm3
Melting Point700 °C
Boiling Point1737 °C

Thermal properties
PhaseSolid
Melting Point700 °C
Boiling Point1737 °C
Absolute Melting Point973 K
Absolute Boiling Point2010 K
Heat of Fusion8 kJ/mol
Heat of Vaporization125 kJ/mol
Heat of CombustionN/A
Specific Heat92 J/(kg K)[note]
Thermal Conductivity19 W/(m K)
Thermal ExpansionN/A

Bulk physical properties
Density5 g/cm3
Density (Liquid)N/A
Molar Volume0.0000452
Thermal Conductivity19 W/(m K)
Thermal ExpansionN/A

Reactivity
Valence2
Electronegativity0.9
ElectronAffinityN/A
Ionization Energies
509.3, 979 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blocks
Group2
Period7
Electron Configuration[Rn]7s2
ColorSilver
Discovery
1898 in France
Gas phaseN/A
CAS NumberCAS7440-14-4

Electrical properties
Electrical TypeConductor
Electrical Conductivity1×106 S/m
Resistivity1×10-6 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeN/A
Curie PointN/A
Mass Magnetic SusceptibilityN/A
Molar Magnetic SusceptibilityN/A
Volume Magnetic SusceptibilityN/A

Abundances
% in UniverseN/A
% in SunN/A
% in MeteoritesN/A
% in Earth's Crust9.9×10-12%
% in Oceans1×10-15%
% in Humans1×10-13%

Atomic dimensions and structure
Atomic RadiusN/A
Covalent RadiusN/A
Van der Waals RadiusN/A
Crystal StructureBody Centered Cubic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
514.8, 514.8, 514.8 pm
Space Group NameIm_ 3m
Space Group Number229

Nuclear Properties
Half-Life1.59×103 y
Lifetime2.31×103 y

Notes on the properties of Radium:
Atomic Weight: Atomic mass number given for longest lived isotope.
Specific Heat: Value given for gas phase.