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Os Element
Osmium


Periodic Table
Symbol
Os
Group Number
8 10
Period Number
6 2
Block
d block
Element Family
Transition Metal
CAS Number
7440042 75
Space Group Name
P63/mmc
Space Group Number
194.00 7
Facts
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
Who Discovered
Smithson Tennant
Discovery
In 1803
Abundance
Abundance In Universe
0.00 % 22
Abundance In Sun
0.00 % 25
Abundance In Meteorites
0.00 % 28
Abundance In Earth's Crust
0.00 % 53
Abundance In Oceans
0.00 % 48
Abundance In Humans
0.00 % 24
Uses
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
-
Other Uses
Alloys
Biological Properties
Toxicity
Highly Toxic
Present in Human Body
No
In Blood
0.00 Blood/mg dm-3 37
In Bone
0.00 p.p.m. 41
Physical
Melting Point
3,045.00 °C 3
Boiling Point
5,027.00 °C 6
Appearance
Physical State
Solid
Color
Silvery Bluish-Gray
Luster
Metallic
Hardness
Mohs Hardness
7.00 3
Brinell Hardness
3,490.00 MPa 1
Vickers Hardness
3,920.00 MPa 1
Speed of Sound
4,940.00 m/s 15
Optical Properties
Refractive Index
2.07 12
Reflectivity
80.00 % 7
Allotropes
No
α Allotropes
-
β Allotropes
-
γ Allotropes
-
Chemical
Chemical Formula
Os
Isotopes
Known Isotopes
35 4
Electronegativity
Pauling Electronegativity
2.20 5
Sanderson Electronegativity
2.20 8
Allred Rochow Electronegativity
1.52 13
Mulliken-Jaffe Electronegativity
2.20 6
Allen Electronegativity
1.65 22
Electropositivity
Pauling Electropositivity
1.80 50
Ionization Energies
1st Energy Level
840.00 kJ/mol 12
2nd Energy Level
1,309.80 kJ/mol 54
3rd Energy Level
1,600.00 kJ/mol 86
4th Energy Level
840.00 kJ/mol 83
5th Energy Level
8,400.00 kJ/mol 10
6th Energy Level
8,400.00 kJ/mol 30
7th Energy level
8,400.00 kJ/mol 25
8th Energy Level
8,400.00 kJ/mol 25
9th Energy Level
5,280.00 kJ/mol 71
10th Energy Level
8,400.00 kJ/mol 26
11th Energy Level
8,400.00 kJ/mol 23
12th Energy Level
8,400.00 kJ/mol 42
13th Energy Level
8,400.00 kJ/mol 18
14th Energy Level
840.00 kJ/mol 74
15th Energy Level
84,000.00 kJ/mol 12
16th Energy Level
840.00 kJ/mol 75
17th Energy Level
840.00 kJ/mol 29
18th Energy Level
8,400.00 kJ/mol 18
19th Energy Level
840.00 kJ/mol 27
20th Energy Level
840.00 kJ/mol 19
21st Energy Level
840.00 kJ/mol 39
22nd Energy Level
840.00 kJ/mol 15
23rd Energy Level
840.00 kJ/mol 41
24th Energy Level
840.00 kJ/mol 11
25th Energy Level
840.00 kJ/mol 9
26th Energy Level
840.00 kJ/mol 9
27th Energy Level
713.30 kJ/mol 24
28th Energy Level
840.10 kJ/mol 13
29th Energy Level
840.00 kJ/mol 13
30th Energy Level
840.00 kJ/mol 9
Electrochemical Equivalent
1.77 g/amp-hr 42
Electron Work Function
4.83 eV 13
Other Chemical Properties
Chemical Stability, Ionization, Solubility
Atomic
Atomic Number
76 40
Electron Configuration
[Xe] 4f14 5d6 6s2
Crystal Structure
Hexagonal Close Packed (HCP)
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
Atom
Number of Protons
76 39
Number of Neutrons
114 26
Number of Electrons
76 39
Radius of an Atom
Atomic Radius
133.80 pm 46
Covalent Radius
128.00 pm 52
Van der Waals Radius
216.00 pm 30
Atomic Weight
190.23 amu 35
Atomic Volume
8.49 cm3/mol 76
Adjacent Atomic Numbers
Previous Element
64
Next Element
33
Valence Electron Potential
91.40 (-eV) 12
Lattice Constant
273.44 pm 73
Lattice Angles
π/2, π/2, 2 π/3
Lattice C/A Ratio
1.58 37
Mechanical
Density
Density At Room Temperature
22.59 g/cm3 9
Density When Liquid (at m.p.)
20.00 g/cm3 11
Tensile Strength
1,000.00 MPa 4
Viscosity
0.00 3
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa) 16
Vapor Pressure at 2000 K
0.00 (Pa) 39
Elasticity properties
Shear Modulus
222.00 GPa 1
Bulk Modulus
462.00 GPa 1
Young's Modulus
528.00 GPa 1
Poisson Ratio
0.25 24
Other Mechanical Properties
Ductile
Magnetic
Magnetic Characteristics
Specific Gravity
22.57 11
Magnetic Ordering
Paramagnetic
Permeability
0.00 H/m 17
Susceptibility
0.00 17
Electrical Properties
Electrical Property
Conductor
Resistivity
81.20 nΩ·m 35
Electrical Conductivity
0.11 106/cm Ω 21
Electron Affinity
106.10 kJ/mol 10
Thermal
Specific Heat
0.13 J/(kg K) 40
Molar Heat Capacity
24.70 J/mol·K 58
Thermal Conductivity
87.60 W/m·K 19
Critical Temperature
3,300.00 K 3
Thermal Expansion
5.10 µm/(m·K) 71
Enthalpy
Enthalpy of Vaporization
627.60 kJ/mol 8
Enthalpy of Fusion
29.30 kJ/mol 4
Enthalpy of Atomization
669.00 kJ/mol 6
Standard Molar Entropy
32.60 J/mol.K 64
Summary >>
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