Niobium Properties

Niobium

Physical

Melting Point

2,468.00 °C 6

Boiling Point

2,468.00 °C 45

Hardness

Mohs Hardness

6.00 6

Brinell Hardness

735.00 MPa 14

Vickers Hardness

870.00 MPa 12

Optical Properties

Refractive Index

Not Available 0

Reflectivity

Not Available 0

Speed of Sound

3,480.00 m/s 21

Allotropes

No 0

α Allotropes

Not Available 0

β Allotropes

Not Available 0

γ Allotropes

Not Available 0

Chemical

Chemical Formula

Nb 0

Isotopes

Known Isotopes

17 22

Electronegativity

Pauling Electronegativity

1.60 23

Sanderson Electronegativity

1.42 16

Allred Rochow Electronegativity

1.23 25

Mulliken-Jaffe Electronegativity

Not Available 0

Allen Electronegativity

1.41 31

Electropositivity

Pauling Electropositivity

2.40 31

Ionization Energies

1st Energy Level

652.10 kJ/mol 41

2nd Energy Level

1,380.00 kJ/mol 50

3rd Energy Level

2,416.00 kJ/mol 50

Electrochemical Equivalent

0.69 g/amp-hr 66

Electron Work Function

4.30 eV 18

Other Chemical Properties

Anti Corrosion, Ionization, Radioactive Isotopes, Solubility 0

Mechanical

Density

Density At Room Temperature

8.57 g/cm³ 48

Density When Liquid (at m.p.)

Not Available 0

Vapor Pressure

Vapor Pressure at 1000 K

Not Available 0

Vapor Pressure at 2000 K

0.00 (Pa) 27

Tensile Strength

330.00 MPa 12

Viscosity

Not Available 0

Elasticity properties

Shear Modulus

38.00 GPa 19

Bulk Modulus

170.00 GPa 10

Young's Modulus

105.00 GPa 20

Poisson Ratio

0.40 4

Other Mechanical Properties

Ductile, Malleable 0

Periodic Table

Symbol

Nb 0

Group Number

5 13

Period Number

5 3

Block

d block 0

Element Family

Transition Metal 0

Atomic

Atomic Number

41 71

Atomic Weight

92.91 amu 65

Atomic Volume

10.87 cm3/mol 45

Electron Configuration

[Kr] 4d⁴ 5s¹ 0

Valence Electron Potential

104.00 (-eV) 8

Atom

Number of Protons

41 70

Number of Neutrons

52 53

Number of Electrons

41 70

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

164.00 pm 28

Van der Waals Radius

200.00 pm 28

Lattice Constant

330.04 pm 51

Lattice Angles

π/2, π/2, π/2 0

Lattice C/A Ratio

Not Available 0

Adjacent Atomic Numbers

Next Element

34 0

Previous Element

56 0

Magnetic

Electrical Properties

Resistivity

152.00 nΩ·m 23

Electrical Conductivity

0.07 10⁶/cm Ω 28

Electron Affinity

86.10 kJ/mol 12

Electrical Property

Conductor 0

Magnetic Characteristics

Specific Gravity

8.57 37

Magnetic Ordering

Paramagnetic 0

Permeability

Not Available 0

Susceptibility

Not Available 0

Thermal

Specific Heat

0.26 J/(kg K) 20

Thermal Conductivity

53.70 W/m·K 29

Critical Temperature

Not Available 0

Molar Heat Capacity

24.60 J/mol·K 50

Thermal Expansion

7.30 µm/(m·K) 48

Standard Molar Entropy

36.40 J/mol.K 42

Enthalpy

Enthalpy of Vaporization

696.60 kJ/mol 4

Enthalpy of Fusion

27.20 kJ/mol 6

Enthalpy of Atomization

745.00 kJ/mol 4

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Niobium Properties

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