Osmium Properties

Osmium

Physical

Melting Point

3,045.00 °C 3

Boiling Point

5,027.00 °C 6

Hardness

Mohs Hardness

7.00 3

Brinell Hardness

3,490.00 MPa 1

Vickers Hardness

Not Available 0

Optical Properties

Refractive Index

Not Available 0

Reflectivity

Not Available 0

Speed of Sound

4,940.00 m/s 11

Allotropes

No 0

α Allotropes

Not Available 0

β Allotropes

Not Available 0

γ Allotropes

Not Available 0

Chemical

Chemical Formula

Os 0

Isotopes

Known Isotopes

35 4

Electronegativity

Pauling Electronegativity

2.20 4

Sanderson Electronegativity

Not Available 0

Allred Rochow Electronegativity

1.52 12

Mulliken-Jaffe Electronegativity

Not Available 0

Allen Electronegativity

1.65 19

Electropositivity

Pauling Electropositivity

1.80 49

Ionization Energies

1st Energy Level

840.00 kJ/mol 12

2nd Energy Level

1,309.80 kJ/mol 53

3rd Energy Level

1,600.00 kJ/mol 82

Electrochemical Equivalent

1.77 g/amp-hr 38

Electron Work Function

4.83 eV 8

Other Chemical Properties

Chemical Stability, Ionization, Solubility 0

Mechanical

Density

Density At Room Temperature

22.59 g/cm³ 9

Density When Liquid (at m.p.)

20.00 g/cm3 1

Vapor Pressure

Vapor Pressure at 1000 K

Not Available 0

Vapor Pressure at 2000 K

0.00 (Pa) 28

Tensile Strength

1,000.00 MPa 4

Viscosity

Not Available 0

Elasticity properties

Shear Modulus

222.00 GPa 1

Bulk Modulus

462.00 GPa 1

Young's Modulus

Not Available 0

Poisson Ratio

0.25 24

Other Mechanical Properties

Ductile 0

Periodic Table

Symbol

Os 0

Group Number

8 10

Period Number

6 2

Block

d block 0

Element Family

Transition Metal 0

Atomic

Atomic Number

76 40

Atomic Weight

190.23 amu 35

Atomic Volume

8.49 cm3/mol 58

Electron Configuration

[Xe] 4f¹⁴ 5d⁶ 6s² 0

Valence Electron Potential

91.40 (-eV) 12

Atom

Number of Protons

76 39

Number of Neutrons

114 25

Number of Electrons

76 39

Crystal Structure

Hexagonal Close Packed (HCP) 0

Crystal Lattice

BCC-Crystal-Structure-.jpg#100 0

Radius of an Atom

Atomic Radius

133.80 pm 44

Covalent Radius

Not Available 0

Van der Waals Radius

216.00 pm 24

Lattice Constant

273.44 pm 66

Lattice Angles

π/2, π/2, 2 π/3 0

Lattice C/A Ratio

1.58 14

Adjacent Atomic Numbers

Next Element

33 0

Previous Element

64 0

Magnetic

Electrical Properties

Resistivity

81.20 nΩ·m 35

Electrical Conductivity

0.11 10⁶/cm Ω 18

Electron Affinity

106.10 kJ/mol 9

Electrical Property

Conductor 0

Magnetic Characteristics

Specific Gravity

22.57 2

Magnetic Ordering

Paramagnetic 0

Permeability

Not Available 0

Susceptibility

Not Available 0

Thermal

Specific Heat

0.13 J/(kg K) 39

Thermal Conductivity

87.60 W/m·K 19

Critical Temperature

Not Available 0

Molar Heat Capacity

24.70 J/mol·K 49

Thermal Expansion

5.10 µm/(m·K) 56

Standard Molar Entropy

32.60 J/mol.K 47

Enthalpy

Enthalpy of Vaporization

627.60 kJ/mol 7

Enthalpy of Fusion

29.30 kJ/mol 4

Enthalpy of Atomization

669.00 kJ/mol 6

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Osmium Properties

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