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Iridium vs Chromium

Iridium
Chromium
Chromium vs Iridium


Periodic Table
Symbol
Ir   
Cr   
Group Number
9   
9
6   
12
Period Number
6   
4   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7439885   
99+
7440473   
39
Space Group Name
Fm_ 3m   
Im_ 3m   
Space Group Number
225.00   
2
229.00   
1
Facts
Interesting Facts
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
  • Chromium is highly reactive, hence it is not found free in nature.
  • Ores of Chromites mineral are the major source of Chromium metal.
  • Almost 90% leather tanning is done with the help of chromium.
  
Sources
Found in Minerals, Mining, Ores of Minerals   
Found in Minerals, Mining, Ores of metals, Ores of Minerals   
History
  
  
Who Discovered
Smithson Tennant   
Louis Nicolas Vauquelin   
Discovery
In 1803   
In Between 1797 - 1798   
Abundance
  
  
Abundance In Universe
2 * 10-7 %   
22
1.5 * 10-3 %   
7
Abundance In Sun
~0.0000002 %   
25
~0.002 %   
7
Abundance In Meteorites
0.00 %   
29
0.30 %   
7
Abundance In Earth's Crust
0.00 %   
99+
0.01 %   
13
Abundance In Oceans
Not Available   
0.00 %   
16
Abundance In Humans
Not Available   
0.00 %   
16
Uses
Uses & Benefits
  • 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.
  
  • It is used to harden the steel and produces a stainless steel and other various alloys.
  • It is also used to give proper finish to polished mirrors. Its chromium plates are used in bathroom fittings.
  
Industrial Uses
Automobile Industry, Electrical Industry, Electronic Industry   
Automobile Industry, Chemical Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys   
Alloys   
Biological Properties
  
  
Toxicity
Toxic   
Highly Toxic   
Present in Human Body
Yes   
Yes   
In Blood
Not Available   
0.11 Blood/mg dm-3   
12
In Bone
Not Available   
0.33 p.p.m.   
21
Physical Properties
Melting Point
2,410.00 °C   
7
1,857.00 °C   
14
Boiling Point
4,527.00 °C   
10
2,672.00 °C   
39
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silver   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
6.50   
5
8.50   
1
Brinell Hardness
1,670.00 MPa   
5
687.00 MPa   
16
Vickers Hardness
1,760.00 MPa   
3
1,060.00 MPa   
10
Speed of Sound
4,825.00 m/s   
13
5,940.00 m/s   
5
Optical Properties
  
  
Reflectivity
78.00 %   
6
Not Available   
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
Ir   
Cr   
Isotopes
  
  
Known Isotopes
34   
5
21   
18
Electronegativity
  
  
Pauling Electronegativity
2.20   
4
1.66   
18
Sanderson Electronegativity
Not Available   
1.66   
14
Allred Rochow Electronegativity
1.55   
11
1.56   
10
Allen Electronegativity
1.68   
17
1.65   
19
Electropositivity
  
  
Pauling Electropositivity
1.80   
99+
2.34   
36
Ionization Energies
  
  
1st Energy Level
880.00 kJ/mol   
9
26,130.00 kJ/mol   
1
2nd Energy Level
1,600.00 kJ/mol   
35
28,750.00 kJ/mol   
1
3rd Energy Level
Not Available   
34,230.00 kJ/mol   
1
4th Energy Level
Not Available   
37,066.00 kJ/mol   
1
5th Energy Level
Not Available   
97,510.00 kJ/mol   
1
6th Energy Level
Not Available   
105,800.00 kJ/mol   
1
7th Energy level
Not Available   
114,300.00 kJ/mol   
1
8th Energy Level
Not Available   
125,300.00 kJ/mol   
1
9th Energy Level
Not Available   
134,700.00 kJ/mol   
1
10th Energy Level
Not Available   
144,300.00 kJ/mol   
1
11th Energy Level
Not Available   
26,130.00 kJ/mol   
12
12th Energy Level
Not Available   
28,750.00 kJ/mol   
13
13th Energy Level
Not Available   
34,230.00 kJ/mol   
10
14th Energy Level
Not Available   
37,066.00 kJ/mol   
12
15th Energy Level
Not Available   
97,510.00 kJ/mol   
1
16th Energy Level
Not Available   
105,800.00 kJ/mol   
2
17th Energy Level
Not Available   
114,300.00 kJ/mol   
3
18th Energy Level
Not Available   
125,300.00 kJ/mol   
4
19th Energy Level
Not Available   
134,700.00 kJ/mol   
5
20th Energy Level
Not Available   
144,300.00 kJ/mol   
7
21st Energy Level
Not Available   
157,700.00 kJ/mol   
7
22nd Energy Level
Not Available   
166,090.00 kJ/mol   
6
Electrochemical Equivalent
1.14 g/amp-hr   
99+
0.32 g/amp-hr   
99+
Electron Work Function
4.55 eV   
13
4.50 eV   
14
Other Chemical Properties
Flammable, Ionization, Radioactive Isotopes, Radioactivity   
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
77   
39
24   
99+
Electron Configuration
[Xe] 4f14 5d7 6s2   
[Ar] 3d5 4s1   
Crystal Structure
Face Centered Cubic (FCC)   
Body Centered Cubic (BCC)   
Crystal Lattice
FCC-Crystal-Structure-of-Iridium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
74   
99+
24   
99+
Number of Neutrons
110   
27
28   
99+
Number of Electrons
74   
99+
24   
99+
Radius of an Atom
  
  
Atomic Radius
136.00 pm   
99+
128.00 pm   
99+
Covalent Radius
141.00 pm   
99+
139.00 pm   
99+
Van der Waals Radius
202.00 pm   
27
200.00 pm   
28
Atomic Weight
192.22 amu   
34
52.00 amu   
99+
Atomic Volume
9.53 cm3/mol   
99+
7.23 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Osmium
  
Vanadium
  
Next Element
Platinum
  
Manganese
  
Valence Electron Potential
140.00 (-eV)   
5
170.00 (-eV)   
4
Lattice Constant
383.90 pm   
26
291.00 pm   
99+
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
22.56 g/cm3   
10
7.19 g/cm3   
99+
Density When Liquid (at m.p.)
19.00 g/cm3   
3
6.30 g/cm3   
40
Tensile Strength
2,000.00 MPa   
2
689.00 MPa   
7
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
24
Vapor Pressure at 2000 K
0.00 (Pa)   
25
774.00 (Pa)   
1
Elasticity properties
  
  
Shear Modulus
210.00 GPa   
2
115.00 GPa   
9
Bulk Modulus
320.00 GPa   
3
160.00 GPa   
11
Young's Modulus
528.00 GPa   
1
279.00 GPa   
8
Poisson Ratio
0.26   
22
0.21   
32
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
21.78   
3
7.19   
99+
Magnetic Ordering
Paramagnetic   
Antiferromagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
NA   
Resistivity
47.10 nΩ·m   
99+
125.00 nΩ·m   
27
Electrical Conductivity
0.19 106/cm Ω   
10
0.08 106/cm Ω   
25
Electron Affinity
151.00 kJ/mol   
4
64.30 kJ/mol   
15
Thermal Properties
Specific Heat
0.13 J/(kg K)   
39
0.45 J/(kg K)   
12
Molar Heat Capacity
25.10 J/mol·K   
99+
23.35 J/mol·K   
99+
Thermal Conductivity
147.00 W/m·K   
10
93.90 W/m·K   
17
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
6.40 µm/(m·K)   
99+
4.90 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
799.10 kJ/mol   
1
348.80 kJ/mol   
24
Enthalpy of Fusion
35.23 kJ/mol   
1
15.31 kJ/mol   
20
Enthalpy of Atomization
837.00 kJ/mol   
1
397.50 kJ/mol   
21
Standard Molar Entropy
35.50 J/mol.K   
99+
23.80 J/mol.K   
99+
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