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Osmium vs Iridium

Osmium
Iridium
Iridium vs Osmium


Periodic Table
Symbol
Os   
Ir   
Group Number
8   
10
9   
9
Period Number
6   
6   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7440042   
99+
7439885   
99+
Space Group Name
P63/mmc   
Fm_ 3m   
Space Group Number
194.00   
5
225.00   
2
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.
  
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
Sources
Found As a By-product, Found in Minerals, Mining   
Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Smithson Tennant   
Smithson Tennant   
Discovery
In 1803   
In 1803   
Abundance
  
  
Abundance In Universe
3 * 10-7 %   
21
2 * 10-7 %   
22
Abundance In Sun
~0.0000002 %   
25
~0.0000002 %   
25
Abundance In Meteorites
0.00 %   
28
0.00 %   
29
Abundance In Earth's Crust
0.00 %   
99+
0.00 %   
99+
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.
  
  • Iridium has an anti corrosion properties and it is used in special alloy with Osmium metal and that alloy is used in pen tips and compass bearings.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys   
Alloys   
Biological Properties
  
  
Toxicity
Highly Toxic   
Toxic   
Present in Human Body
No   
Yes   
Physical Properties
Melting Point
3,045.00 °C   
3
2,410.00 °C   
7
Boiling Point
5,027.00 °C   
6
4,527.00 °C   
10
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery Bluish-Gray   
Silvery White   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
7.00   
3
6.50   
5
Brinell Hardness
3,490.00 MPa   
1
1,670.00 MPa   
5
Vickers Hardness
Not Available   
1,760.00 MPa   
3
Speed of Sound
4,940.00 m/s   
11
4,825.00 m/s   
13
Optical Properties
  
  
Reflectivity
Not Available   
78.00 %   
6
Allotropes
No   
No   
α Allotropes
Not Available   
Not Available   
β Allotropes
Not Available   
Not Available   
γ Allotropes
Not Available   
Not Available   
Chemical Properties
Chemical Formula
Os   
Ir   
Isotopes
  
  
Known Isotopes
35   
4
34   
5
Electronegativity
  
  
Pauling Electronegativity
2.20   
4
2.20   
4
Allred Rochow Electronegativity
1.52   
12
1.55   
11
Allen Electronegativity
1.65   
19
1.68   
17
Electropositivity
  
  
Pauling Electropositivity
1.80   
99+
1.80   
99+
Ionization Energies
  
  
1st Energy Level
840.00 kJ/mol   
12
880.00 kJ/mol   
9
2nd Energy Level
1,309.80 kJ/mol   
99+
1,600.00 kJ/mol   
35
3rd Energy Level
1,600.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
1.77 g/amp-hr   
38
1.14 g/amp-hr   
99+
Electron Work Function
4.83 eV   
8
4.55 eV   
13
Other Chemical Properties
Chemical Stability, Ionization, Solubility   
Flammable, Ionization, Radioactive Isotopes, Radioactivity   
Atomic Properties
Atomic Number
76   
40
77   
39
Electron Configuration
[Xe] 4f14 5d6 6s2   
[Xe] 4f14 5d7 6s2   
Crystal Structure
Hexagonal Close Packed (HCP)   
Face Centered Cubic (FCC)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
FCC-Crystal-Structure-of-Iridium.jpg#100   
Atom
  
  
Number of Protons
76   
39
74   
99+
Number of Neutrons
114   
25
110   
27
Number of Electrons
76   
39
74   
99+
Radius of an Atom
  
  
Atomic Radius
133.80 pm   
99+
136.00 pm   
99+
Covalent Radius
Not Available   
141.00 pm   
99+
Van der Waals Radius
216.00 pm   
24
202.00 pm   
27
Atomic Weight
190.23 amu   
35
192.22 amu   
34
Atomic Volume
8.49 cm3/mol   
99+
9.53 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Rhenium
  
Osmium
  
Next Element
Iridium
  
Platinum
  
Valence Electron Potential
91.40 (-eV)   
12
140.00 (-eV)   
5
Lattice Constant
273.44 pm   
99+
383.90 pm   
26
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   
Lattice C/A Ratio
1.58   
14
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
22.59 g/cm3   
9
22.56 g/cm3   
10
Density When Liquid (at m.p.)
20.00 g/cm3   
1
19.00 g/cm3   
3
Tensile Strength
1,000.00 MPa   
4
2,000.00 MPa   
2
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.00 (Pa)   
28
0.00 (Pa)   
25
Elasticity properties
  
  
Shear Modulus
222.00 GPa   
1
210.00 GPa   
2
Bulk Modulus
462.00 GPa   
1
320.00 GPa   
3
Young's Modulus
Not Available   
528.00 GPa   
1
Poisson Ratio
0.25   
24
0.26   
22
Other Mechanical Properties
Ductile   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
22.57   
2
21.78   
3
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
81.20 nΩ·m   
35
47.10 nΩ·m   
99+
Electrical Conductivity
0.11 106/cm Ω   
18
0.19 106/cm Ω   
10
Electron Affinity
106.10 kJ/mol   
9
151.00 kJ/mol   
4
Thermal Properties
Specific Heat
0.13 J/(kg K)   
39
0.13 J/(kg K)   
39
Molar Heat Capacity
24.70 J/mol·K   
99+
25.10 J/mol·K   
99+
Thermal Conductivity
87.60 W/m·K   
19
147.00 W/m·K   
10
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
5.10 µm/(m·K)   
99+
6.40 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
627.60 kJ/mol   
7
799.10 kJ/mol   
1
Enthalpy of Fusion
29.30 kJ/mol   
4
35.23 kJ/mol   
1
Enthalpy of Atomization
669.00 kJ/mol   
6
837.00 kJ/mol   
1
Standard Molar Entropy
32.60 J/mol.K   
99+
35.50 J/mol.K   
99+
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