Cobalt Properties

Cobalt

Physical

Melting Point

1,495.00 °C 29

Boiling Point

2,870.00 °C 34

Hardness

Mohs Hardness

5.00 8

Brinell Hardness

470.00 MPa 26

Vickers Hardness

1,043.00 MPa 11

Optical Properties

Refractive Index

Not Available 0

Reflectivity

67.00 % 11

Speed of Sound

4,720.00 m/s 14

Allotropes

Yes 0

α Allotropes

α-Cobalt 0

β Allotropes

β-Cobalt 0

γ Allotropes

Not Available 0

Chemical

Chemical Formula

Co 0

Isotopes

Known Isotopes

26 13

Electronegativity

Pauling Electronegativity

1.88 12

Sanderson Electronegativity

2.56 1

Allred Rochow Electronegativity

1.70 5

Mulliken-Jaffe Electronegativity

Not Available 0

Allen Electronegativity

1.84 10

Electropositivity

Pauling Electropositivity

2.12 41

Ionization Energies

1st Energy Level

760.40 kJ/mol 19

2nd Energy Level

1,648.00 kJ/mol 31

3rd Energy Level

3,232.00 kJ/mol 22

Electrochemical Equivalent

1.10 g/amp-hr 57

Electron Work Function

5.00 eV 5

Other Chemical Properties

Chemical Stability, Ionization 0

Mechanical

Density

Density At Room Temperature

4.51 g/cm³ 70

Density When Liquid (at m.p.)

4.11 g/cm3 49

Vapor Pressure

Vapor Pressure at 1000 K

Not Available 0

Vapor Pressure at 2000 K

0.98 (Pa) 14

Tensile Strength

434.00 MPa 9

Viscosity

Not Available 0

Elasticity properties

Shear Modulus

44.00 GPa 17

Bulk Modulus

110.00 GPa 15

Young's Modulus

116.00 GPa 18

Poisson Ratio

0.32 12

Other Mechanical Properties

Ductile 0

Periodic Table

Symbol

Co 0

Group Number

9 9

Period Number

4 4

Block

d block 0

Element Family

Transition Metal 0

Atomic

Atomic Number

22 84

Atomic Weight

47.87 amu 78

Atomic Volume

10.64 cm3/mol 46

Electron Configuration

[Ar] 3d² 4s² 0

Valence Electron Potential

95.20 (-eV) 10

Atom

Number of Protons

22 83

Number of Neutrons

26 62

Number of Electrons

22 83

Crystal Structure

Hexagonal Close Packed (HCP) 0

Crystal Lattice

HCP-Crystal-Structure-of-Cobalt.jpg#100 0

Radius of an Atom

Atomic Radius

147.00 pm 34

Covalent Radius

160.00 pm 30

Van der Waals Radius

200.00 pm 28

Lattice Constant

295.08 pm 61

Lattice Angles

π/2, π/2, 2 π/3 0

Lattice C/A Ratio

Not Available 0

Adjacent Atomic Numbers

Next Element

22 0

Previous Element

7 0

Magnetic

Electrical Properties

Resistivity

420.00 nΩ·m 12

Electrical Conductivity

0.02 10⁶/cm Ω 42

Electron Affinity

7.60 kJ/mol 37

Electrical Property

Poor Conductor 0

Magnetic Characteristics

Specific Gravity

4,500.00 1

Magnetic Ordering

Paramagnetic 0

Permeability

Not Available 0

Susceptibility

Not Available 0

Thermal

Specific Heat

0.52 J/(kg K) 9

Thermal Conductivity

21.90 W/m·K 43

Critical Temperature

Not Available 0

Molar Heat Capacity

25.06 J/mol·K 44

Thermal Expansion

8.60 µm/(m·K) 45

Standard Molar Entropy

27.30 J/mol.K 56

Enthalpy

Enthalpy of Vaporization

429.00 kJ/mol 15

Enthalpy of Fusion

15.48 kJ/mol 19

Enthalpy of Atomization

468.60 kJ/mol 15

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Cobalt Properties

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