Tantalum Properties

Tantalum

Physical

Melting Point

2,996.00 °C 4

Boiling Point

5,425.00 °C 4

Hardness

Mohs Hardness

6.50 5

Brinell Hardness

440.00 MPa 28

Vickers Hardness

870.00 MPa 12

Optical Properties

Refractive Index

Not Available 0

Reflectivity

78.00 % 6

Speed of Sound

3,400.00 m/s 22

Allotropes

No 0

α Allotropes

Not Available 0

β Allotropes

Not Available 0

γ Allotropes

Not Available 0

Chemical

Chemical Formula

Ta 0

Isotopes

Known Isotopes

31 8

Electronegativity

Pauling Electronegativity

1.50 27

Sanderson Electronegativity

Not Available 0

Allred Rochow Electronegativity

1.33 22

Mulliken-Jaffe Electronegativity

Not Available 0

Allen Electronegativity

1.34 33

Electropositivity

Pauling Electropositivity

2.50 27

Ionization Energies

1st Energy Level

761.00 kJ/mol 18

2nd Energy Level

1,500.00 kJ/mol 40

3rd Energy Level

Not Available 0

Electrochemical Equivalent

1.35 g/amp-hr 49

Electron Work Function

4.25 eV 21

Other Chemical Properties

Anti Corrosion, Ionization, Radioactive Isotopes, Radioactivity, Solubility 0

Mechanical

Density

Density At Room Temperature

16.69 g/cm³ 18

Density When Liquid (at m.p.)

15.00 g/cm3 9

Vapor Pressure

Vapor Pressure at 1000 K

Not Available 0

Vapor Pressure at 2000 K

0.00 (Pa) 31

Tensile Strength

Not Available 0

Viscosity

Not Available 0

Elasticity properties

Shear Modulus

69.00 GPa 13

Bulk Modulus

200.00 GPa 8

Young's Modulus

186.00 GPa 13

Poisson Ratio

0.34 10

Other Mechanical Properties

Ductile 0

Periodic Table

Symbol

Ta 0

Group Number

5 13

Period Number

6 2

Block

d block 0

Element Family

Transition Metal 0

Atomic

Atomic Number

73 43

Atomic Weight

180.95 amu 38

Atomic Volume

10.90 cm3/mol 44

Electron Configuration

[Xe] 4f¹⁴ 5d³ 6s² 0

Valence Electron Potential

110.00 (-eV) 7

Atom

Number of Protons

73 42

Number of Neutrons

108 28

Number of Electrons

73 42

Crystal Structure

Body Centered Cubic (BCC) 0

Crystal Lattice

BCC-Crystal-Structure-.jpg#100 0

Radius of an Atom

Atomic Radius

146.00 pm 35

Covalent Radius

170.00 pm 25

Van der Waals Radius

200.00 pm 28

Lattice Constant

330.13 pm 50

Lattice Angles

π/2, π/2, π/2 0

Lattice C/A Ratio

Not Available 0

Adjacent Atomic Numbers

Next Element

32 0

Previous Element

63 0

Magnetic

Electrical Properties

Resistivity

131.00 nΩ·m 25

Electrical Conductivity

0.08 10⁶/cm Ω 27

Electron Affinity

31.00 kJ/mol 29

Electrical Property

Conductor 0

Magnetic Characteristics

Specific Gravity

16.65 11

Magnetic Ordering

Paramagnetic 0

Permeability

Not Available 0

Susceptibility

Not Available 0

Thermal

Specific Heat

0.14 J/(kg K) 37

Thermal Conductivity

57.50 W/m·K 27

Critical Temperature

Not Available 0

Molar Heat Capacity

25.36 J/mol·K 41

Thermal Expansion

6.30 µm/(m·K) 52

Standard Molar Entropy

41.50 J/mol.K 37

Enthalpy

Enthalpy of Vaporization

753.10 kJ/mol 2

Enthalpy of Fusion

31.40 kJ/mol 3

Enthalpy of Atomization

782.00 kJ/mol 3

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Tantalum Properties

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