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Technical data for Barium

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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
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion8 kJ/mol
Heat of Vaporization140 kJ/mol
Heat of CombustionN/A
Specific Heat205 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
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
Brinell HardnessN/A
Mohs Hardness1.25 MPa
Vickers HardnessN/A
Bulk Modulus9.6 GPa
Shear Modulus4.9 GPa
Young Modulus13 GPa
Poisson RatioN/A
Refractive IndexN/A
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
Heat of CombustionN/A
DOT Hazard Class4.3
DOT Numbers1400
EU NumberN/A
NFPA Fire Rating1
NFPA Hazards
Water Reactive
NFPA Health Rating2
NFPA Reactivity Rating2
RTECS NumberRTECSCQ8370000
NFPA LabelNFPA Label

Classifications
Alternate NamesNone
Names of AllotropesNone
Blocks
Group2
Period6
Electron Configuration[Xe]6s2
ColorSilver
Discovery
1808 in United Kingdom
Gas phaseN/A
CAS NumberCAS7440-39-3
CID NumberCID5355457
Gmelin NumberN/A
NSC NumberN/A
RTECS NumberRTECSCQ8370000

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

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/A
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
Decay ModeN/A
Quantum Numbers1S0
Neutron Cross Section1.3
Neutron Mass Absorption0.00027
Known Isotopes
114Ba, 115Ba, 116Ba, 117Ba, 118Ba, 119Ba, 120Ba, 121Ba, 122Ba, 123Ba, 124Ba, 125Ba, 126Ba, 127Ba, 128Ba, 129Ba, 130Ba, 131Ba, 132Ba, 133Ba, 134Ba, 135Ba, 136Ba, 137Ba, 138Ba, 139Ba, 140Ba, 141Ba, 142Ba, 143Ba, 144Ba, 145Ba, 146Ba, 147Ba, 148Ba, 149Ba, 150Ba, 151Ba, 152Ba, 153Ba
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.

Up to date, curated data provided by
Mathematica's ElementData function from Wolfram Research, Inc.

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