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What is Osmium?

Osmium In Periodic Table

Osmium Symbol
Os

Group Number
8
10
📊

Period Number
6
📊

Block
d block
📊

Element Family
Transition Metal
📊

CAS Number of Osmium
7440042
75

Space Group Name
P63/mmc

Space Group Number
194.00
5
📊

Facts about Osmium

Interesting Facts
  • Osmium metal does not oxidize in air unless it is heated.
  • But if it heated den it forms Osmium Tetroxide, which is highly toxic.

Sources
Found As a By-product, Found in Minerals, Mining

History of Osmium

Who Discovered
Smithson Tennant

Discovery
In 1803

Abundance of Osmium

Abundance In Universe
0.00 %
21
📊

Abundance In Sun
0.00 %
26
📊

Abundance In Meteorites
0.00 %
28
📊

Abundance In Earth's Crust
0.00 %
53
📊

Abundance In Oceans
Not Available

Abundance In Humans
Not Available

Uses of Osmium

Uses & Benefits
  • Its has very limited uses and its alloys are very hard and are used in the manufacturing of pen tips, pivots, needles and electrical contacts.
  • It is also used as industrial catalyst to speed up the chemical reaction.

Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry

Medical Uses
NA

Other Uses
Alloys

Biological Properties

Toxicity
Highly Toxic
📊

Present in Human Body
📊

In Blood
Not Available

In Bone
Not Available

Physical Properties of Osmium

Osmium Melting Point
3,045.00 °C
3
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Osmium Boiling Point
5,027.00 °C
6
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Appearance of Osmium

Physical State
Solid
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Color
Silvery Bluish-Gray

Luster
Metallic
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Hardness of Osmium

Mohs Hardness
7.00
3
📊

Brinell Hardness
3,490.00 MPa
1
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Vickers Hardness
Not Available

Speed of Sound
4,940.00 m/s
11
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Optical Properties

Refractive Index
Not Available

Reflectivity
Not Available

Allotropes

α Allotropes
Not Available

β Allotropes
Not Available

γ Allotropes
Not Available

Chemical Properties of Osmium

Chemical Formula
Os

Isotopes of Osmium

Known Isotopes
35
4
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Electronegativity

Pauling Electronegativity
2.20
4
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Sanderson Electronegativity
Not Available

Allred Rochow Electronegativity
1.52
12
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Mulliken-Jaffe Electronegativity
Not Available

Allen Electronegativity
1.65
19
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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
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3rd Energy Level
1,600.00 kJ/mol
82
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4th Energy Level
Not Available

5th Energy Level
Not Available

6th Energy Level
Not Available

7th Energy level
Not Available

8th Energy Level
Not Available

9th Energy Level
Not Available

10th Energy Level
Not Available

11th Energy Level
Not Available

12th Energy Level
Not Available

13th Energy Level
Not Available

14th Energy Level
Not Available

15th Energy Level
Not Available

16th Energy Level
Not Available

17th Energy Level
Not Available

18th Energy Level
Not Available

19th Energy Level
Not Available

20th Energy Level
Not Available

21st Energy Level
Not Available

22nd Energy Level
Not Available

23rd Energy Level
Not Available

24th Energy Level
Not Available

25th Energy Level
Not Available

26th Energy Level
Not Available

27th Energy Level
Not Available

28th Energy Level
Not Available

29th Energy Level
Not Available

30th Energy Level
Not Available

Electrochemical Equivalent
1.77 g/amp-hr
38
📊

Electron Work Function
4.83 eV
8
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Other Chemical Properties
Chemical Stability, Ionization, Solubility

Atomic Properties of Osmium

Atomic Number of Osmium
76
40
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Osmium Electron Configuration
[Xe] 4f14 5d6 6s2

Crystal Structure
Hexagonal Close Packed (HCP)
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Crystal Lattice
BCC-Crystal-Structure-.jpg#100

Atom of Osmium

Number of Protons
76
39
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Number of Neutrons
114
26
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Number of Electrons
76
39
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Radius of an Atom

Atomic Radius
133.80 pm
44
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Covalent Radius
Not Available

Van der Waals Radius
216.00 pm
24
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Atomic Weight
190.23 amu
35
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Atomic Volume
8.49 cm3/mol
58
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Adjacent Atomic Numbers

Previous Element

Next Element

Valence Electron Potential
91.40 (-eV)
12
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Lattice Constant
273.44 pm
66
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Lattice Angles
π/2, π/2, 2 π/3

Lattice C/A Ratio
1.58
14
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Mechanical Properties of Osmium

Osmium Density

Density At Room Temperature
22.59 g/cm3
9
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Density When Liquid (at m.p.)
20.00 g/cm3
1
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Tensile Strength
1,000.00 MPa
4
📊

Viscosity
Not Available

Vapor Pressure of Osmium

Vapor Pressure at 1000 K
Not Available

Vapor Pressure at 2000 K
0.00 (Pa)
28
📊

Elasticity properties

Shear Modulus
222.00 GPa
1
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Bulk Modulus
462.00 GPa
1
📊

Young's Modulus
Not Available

Poisson Ratio
0.25
24
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Other Mechanical Properties
Ductile

Magnetic Properties of Osmium

Magnetic Characteristics of Osmium

Specific Gravity
22.57
2
📊

Magnetic Ordering
Paramagnetic
📊

Permeability
Not Available

Susceptibility
Not Available

Electrical Properties

Electrical Property
Conductor
📊

Resistivity
81.20 nΩ·m
35
📊

Electrical Conductivity
0.11 106/cm Ω
18
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Electron Affinity
106.10 kJ/mol
9
📊

Thermal Properties of Osmium

Specific Heat
0.13 J/(kg K)
39
📊

Molar Heat Capacity
24.70 J/mol·K
49
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Thermal Conductivity
87.60 W/m·K
19
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Critical Temperature
Not Available

Thermal Expansion
5.10 µm/(m·K)
56
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Enthalpy of Osmium

Enthalpy of Vaporization
627.60 kJ/mol
7
📊

Enthalpy of Fusion
29.30 kJ/mol
4
📊

Enthalpy of Atomization
669.00 kJ/mol
6
📊

Standard Molar Entropy
32.60 J/mol.K
47
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