Hafnium Properties

Hafnium

Physical

Melting Point

2,150.00 °C 10

Boiling Point

5,400.00 °C 5

Hardness

Mohs Hardness

5.50 7

Brinell Hardness

1,450.00 MPa 6

Vickers Hardness

1,520.00 MPa 5

Optical Properties

Refractive Index

Not Available 0

Reflectivity

Not Available 0

Speed of Sound

3,010.00 m/s 27

Allotropes

No 0

α Allotropes

Not Available 0

β Allotropes

Not Available 0

γ Allotropes

Not Available 0

Chemical

Chemical Formula

Hf 0

Isotopes

Known Isotopes

32 7

Electronegativity

Pauling Electronegativity

1.30 32

Sanderson Electronegativity

Not Available 0

Allred Rochow Electronegativity

1.23 25

Mulliken-Jaffe Electronegativity

Not Available 0

Allen Electronegativity

1.16 37

Electropositivity

Pauling Electropositivity

2.70 22

Ionization Energies

1st Energy Level

658.50 kJ/mol 40

2nd Energy Level

1,440.00 kJ/mol 44

3rd Energy Level

2,250.00 kJ/mol 60

Electrochemical Equivalent

1.66 g/amp-hr 44

Electron Work Function

3.90 eV 27

Other Chemical Properties

Anti Corrosion, Ionization, Radioactive Isotopes, Solubility 0

Mechanical

Density

Density At Room Temperature

13.31 g/cm³ 26

Density When Liquid (at m.p.)

12.00 g/cm3 12

Vapor Pressure

Vapor Pressure at 1000 K

Not Available 0

Vapor Pressure at 2000 K

0.00 (Pa) 24

Tensile Strength

445.00 MPa 8

Viscosity

Not Available 0

Elasticity properties

Shear Modulus

30.00 GPa 23

Bulk Modulus

110.00 GPa 15

Young's Modulus

78.00 GPa 25

Poisson Ratio

0.37 7

Other Mechanical Properties

Ductile, Malleable 0

Periodic Table

Symbol

Hf 0

Group Number

4 14

Period Number

6 2

Block

d block 0

Element Family

Transition Metal 0

Atomic

Atomic Number

72 44

Atomic Weight

178.49 amu 39

Atomic Volume

13.60 cm3/mol 38

Electron Configuration

[Xe] 4f¹⁴ 5d² 6s² 0

Valence Electron Potential

81.00 (-eV) 16

Atom

Number of Protons

72 43

Number of Neutrons

106 29

Number of Electrons

72 43

Crystal Structure

Hexagonal Close Packed (HCP) 0

Crystal Lattice

BCC-Crystal-Structure-.jpg#100 0

Radius of an Atom

Atomic Radius

159.00 pm 28

Covalent Radius

175.00 pm 23

Van der Waals Radius

200.00 pm 28

Lattice Constant

319.64 pm 55

Lattice Angles

π/2, π/2, 2 π/3 0

Lattice C/A Ratio

1.58 12

Adjacent Atomic Numbers

Next Element

57 0

Previous Element

80 0

Magnetic

Electrical Properties

Resistivity

331.00 nΩ·m 14

Electrical Conductivity

0.03 10⁶/cm Ω 39

Electron Affinity

0.00 kJ/mol 40

Electrical Property

Conductor 0

Magnetic Characteristics

Specific Gravity

13.31 18

Magnetic Ordering

Paramagnetic 0

Permeability

Not Available 0

Susceptibility

Not Available 0

Thermal

Specific Heat

0.14 J/(kg K) 37

Thermal Conductivity

23.00 W/m·K 41

Critical Temperature

Not Available 0

Molar Heat Capacity

25.73 J/mol·K 36

Thermal Expansion

5.90 µm/(m·K) 54

Standard Molar Entropy

43.60 J/mol.K 34

Enthalpy

Enthalpy of Vaporization

661.10 kJ/mol 5

Enthalpy of Fusion

25.10 kJ/mol 8

Enthalpy of Atomization

703.00 kJ/mol 5

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Hafnium Properties

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