Technical data for Barium

Overview
NameBarium
SymbolBa
Atomic Number56
Atomic Weight137.327
Density3.51 g/cm3
Melting Point727 °C
Boiling Point1870 °C

Thermal properties
PhaseSolid
Melting Point727 °C
Boiling Point1870 °C
Absolute Melting Point1×103 K
Absolute Boiling Point2143 K
Heat of Fusion8 kJ/mol
Heat of Vaporization140 kJ/mol
Heat of CombustionN/A
Specific Heat205 J/(kg K)[note]
Thermal Conductivity18 W/(m K)
Thermal Expansion0.0000206 K-1

Bulk physical properties
Density3.51 g/cm3
Density (Liquid)3.338 g/cm3
Molar Volume0.000039125
Mohs Hardness1.25 MPa
Bulk Modulus9.6 GPa
Shear Modulus4.9 GPa
Young Modulus13 GPa
Speed of Sound1620 m/s
Thermal Conductivity18 W/(m K)
Thermal Expansion0.0000206 K-1

Reactivity
Valence2
Electronegativity0.89
ElectronAffinity13.95 kJ/mol
Ionization Energies
502.9, 965.2, 3.6×103 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A

Classifications
Alternate NamesNone
Nams of AllotropesNone
Blocks
Group2
Period6
Electron Configuration[Xe]6s2
ColorSilver
Discovery
1808 in United Kingdom
Gas phaseN/A
CAS NumberCAS7440-39-3

Electrical properties
Electrical TypeConductor
Electrical Conductivity2.9×106 S/m
Resistivity3.5×10-7 m Ω
Superconducting PointN/A

Magnetic properties
Magnetic TypeParamagnetic
Mass Magnetic Susceptibility1.13×10-8
Molar Magnetic Susceptibility1.552×10-9
Volume Magnetic Susceptibility0.00003966

Abundances
% in Universe1×10-6%
% in Sun1×10-6%
% in Meteorites0.00027%
% in Earth's Crust0.034%
% in Oceans3×10-6%
% in Humans0.00003%

Atomic dimensions and structure
Atomic Radius253 pm
Covalent Radius198 pm
Van der Waals RadiusN/A
Crystal StructureBody Centered Cubic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
502.8, 502.8, 502.8 pm
Space Group NameIm_ 3m
Space Group Number229

Nuclear Properties
Half-LifeStable
LifetimeStable
Stable Isotopes
130Ba, 132Ba, 134Ba, 135Ba, 136Ba, 137Ba, 138Ba
Isotopic Abundances
130Ba0.106%
132Ba0.101%
134Ba2.417%
135Ba6.592%
136Ba7.854%
137Ba11.232%
138Ba71.698%

Notes on the properties of Barium:
Specific Heat: Value given for solid phase.