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Technical data for Tantalum

Click any property name to see plots of that property for all the elements.

Overview
NameTantalum
SymbolTa
Atomic Number73
Atomic Weight180.94788
Density16.65 g/cm3
Melting Point3017 °C
Boiling Point5458 °C

Thermal properties
PhaseSolid
Melting Point3017 °C
Boiling Point5458 °C
Absolute Melting Point3290 K
Absolute Boiling Point5731 K
Critical PressureN/A
Critical TemperatureN/A
Heat of Fusion36 kJ/mol
Heat of Vaporization736 kJ/mol
Specific Heat140 J/(kg K)[note]
Adiabatic IndexN/A
Neel PointN/A
Thermal Conductivity57 W/(m K)
Thermal Expansion6.3×10-6 K-1

Bulk physical properties
Density16.65 g/cm3
Density (Liquid)15 g/cm3
Molar Volume0.0000108677
Brinell Hardness800 MPa
Mohs Hardness6.5
Vickers Hardness873 MPa
Bulk Modulus200 GPa
Shear Modulus67 GPa
Young Modulus186 GPa
Poisson Ratio0.34
Refractive IndexN/A
Speed of Sound3400 m/s
Thermal Conductivity57 W/(m K)
Thermal Expansion6.3×10-6 K-1

Reactivity
Valence5
Electronegativity1.5
ElectronAffinity31 kJ/mol
Ionization Energies
761, 1500 kJ/mol

Health and Safety
DOT Hazard Class
4.1
DOT Numbers3089
RTECS Number
RTECSWW5505000
NFPA LabelN/A

Classifications
Alternate NamesNone
Names of AllotropesNone
Blockd
Group5
Period6
SeriesTransition Metal
Electron Configuration[Xe]6s24f145d3
ColorGray
Discovery
1802 in Sweden
Gas phaseN/A
CAS NumberCAS7440-25-7
CID Number
CID23956
RTECS Number
RTECSWW5505000

Electrical properties
Electrical TypeConductor
Electrical Conductivity7.7×106 S/m
Resistivity1.3×10-7 m Ω
Superconducting Point4.47

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/A
Mass Magnetic Susceptibility1.07×10-8 m3/Kg
Molar Magnetic Susceptibility1.936×10-9 m3/mol
Volume Magnetic Susceptibility0.0001782

Abundances
% in Universe8×10-9%
% in SunN/A
% in Meteorites2×10-6%
% in Earth's Crust0.00017%
% in Oceans2×10-10%
% in HumansN/A

Atomic dimensions and structure
Atomic Radius200 pm
Covalent Radius170 pm
Van der Waals RadiusN/A
Crystal StructureBody-centered Cubic
Lattice Angles
π/2, π/2, π/2
Lattice Constants
330.13, 330.13, 330.13 pm
Space Group NameIm_ 3m
Space Group Number229

Nuclear Properties
Half-LifeStable
LifetimeStable
Decay ModeN/A
Quantum Numbers4F3/2
Neutron Cross Section20.5
Neutron Mass Absorption0.0041
Known Isotopes
155Ta, 156Ta, 157Ta, 158Ta, 159Ta, 160Ta, 161Ta, 162Ta, 163Ta, 164Ta, 165Ta, 166Ta, 167Ta, 168Ta, 169Ta, 170Ta, 171Ta, 172Ta, 173Ta, 174Ta, 175Ta, 176Ta, 177Ta, 178Ta, 179Ta, 180Ta, 181Ta, 182Ta, 183Ta, 184Ta, 185Ta, 186Ta, 187Ta, 188Ta, 189Ta, 190Ta
Stable Isotopes
181Ta
Isotopic Abundances
181Ta99.988%


Notes on the properties of Tantalum:

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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