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Iridium vs Molybdenum

Iridium
Molybdenum
Molybdenum vs Iridium


Periodic Table
Symbol
Ir  
Mo  
Group Number
9  
9
6  
12
Period Number
6  
5  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7439885  
99+
7439987  
99+
Space Group Name
Fm_ 3m  
Im_ 3m  
Space Group Number
225.00  
3
229.00  
2
Facts
Interesting Facts
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
  • Molybdenum is highly reactive metal, hence not found free in nature .
  • Till 18th century Molybdenum element were often mistaken as a carbon or Lead.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Smithson Tennant  
Carl Wilhelm Scheele  
Discovery
In 1803  
In 1778  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
20
Abundance In Sun
0.00 %  
25
0.00 %  
19
Abundance In Meteorites
0.00 %  
29
0.00 %  
24
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
39
Abundance In Oceans
-  
0.00 %  
9
Abundance In Humans
0.00 %  
24
0.00 %  
17
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.
  
  • Its alloys are used to make engine parts, drills, saw blade, etc.
  • Lubricant additive made up of Molybdenum disulfide is commonly used in the industry. It is also used as a catalyst.
  
Industrial Uses
Automobile Industry, Electrical Industry, Electronic Industry  
Aerospace Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Toxic  
Toxic  
Present in Human Body
Yes  
Yes  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
31
In Bone
0.00 p.p.m.  
99+
0.70 p.p.m.  
20
Physical
Melting Point
2,410.00 °C  
7
2,617.00 °C  
5
Boiling Point
4,527.00 °C  
10
4,612.00 °C  
9
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Gray  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.50  
5
5.50  
7
Brinell Hardness
1,670.00 MPa  
5
1,370.00 MPa  
7
Vickers Hardness
1,760.00 MPa  
8
1,400.00 MPa  
11
Speed of Sound
4,825.00 m/s  
17
5,400.00 m/s  
9
Optical Properties
  
  
Refractive Index
2.40  
7
2.00  
15
Reflectivity
78.00 %  
8
58.00 %  
25
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Ir  
Mo  
Isotopes
  
  
Known Isotopes
34  
5
25  
14
Electronegativity
  
  
Pauling Electronegativity
2.20  
5
2.16  
6
Sanderson Electronegativity
2.20  
8
1.15  
34
Allred Rochow Electronegativity
1.55  
12
1.30  
25
Mulliken-Jaffe Electronegativity
2.20  
6
2.16  
7
Allen Electronegativity
1.68  
20
2.16  
3
Electropositivity
  
  
Pauling Electropositivity
1.80  
99+
1.84  
99+
Ionization Energies
  
  
1st Energy Level
880.00 kJ/mol  
9
684.30 kJ/mol  
37
2nd Energy Level
1,600.00 kJ/mol  
36
1,560.00 kJ/mol  
38
3rd Energy Level
2,256.10 kJ/mol  
99+
2,618.00 kJ/mol  
99+
4th Energy Level
880.00 kJ/mol  
99+
4,480.00 kJ/mol  
36
5th Energy Level
8,800.00 kJ/mol  
8
5,257.00 kJ/mol  
99+
6th Energy Level
8,800.00 kJ/mol  
25
6,640.80 kJ/mol  
99+
7th Energy level
8,800.00 kJ/mol  
22
12,125.00 kJ/mol  
13
8th Energy Level
8,800.00 kJ/mol  
22
13,860.00 kJ/mol  
16
9th Energy Level
8,800.00 kJ/mol  
21
15,835.00 kJ/mol  
16
10th Energy Level
8,800.00 kJ/mol  
23
17,980.00 kJ/mol  
18
11th Energy Level
8,800.00 kJ/mol  
20
20,190.00 kJ/mol  
17
12th Energy Level
8,800.00 kJ/mol  
40
22,219.00 kJ/mol  
38
13th Energy Level
8,800.00 kJ/mol  
15
26,930.00 kJ/mol  
13
14th Energy Level
8,800.00 kJ/mol  
14
29,196.00 kJ/mol  
13
15th Energy Level
88,000.00 kJ/mol  
8
52,490.00 kJ/mol  
99+
16th Energy Level
88,000.00 kJ/mol  
9
55,000.00 kJ/mol  
99+
17th Energy Level
880.00 kJ/mol  
26
61,400.00 kJ/mol  
9
18th Energy Level
8,800.00 kJ/mol  
15
67,700.00 kJ/mol  
9
19th Energy Level
880.00 kJ/mol  
24
74,000.00 kJ/mol  
9
20th Energy Level
880.00 kJ/mol  
14
80,400.00 kJ/mol  
10
21st Energy Level
880.00 kJ/mol  
37
87,000.00 kJ/mol  
9
22nd Energy Level
880.00 kJ/mol  
12
93,400.00 kJ/mol  
7
23rd Energy Level
8,800.00 kJ/mol  
7
98,420.00 kJ/mol  
6
24th Energy Level
880.00 kJ/mol  
8
104,400.00 kJ/mol  
2
25th Energy Level
880.00 kJ/mol  
6
121,900.00 kJ/mol  
1
26th Energy Level
880.00 kJ/mol  
6
127,700.00 kJ/mol  
1
27th Energy Level
880.00 kJ/mol  
5
133,800.00 kJ/mol  
1
28th Energy Level
880.00 kJ/mol  
8
139,800.00 kJ/mol  
1
29th Energy Level
880.00 kJ/mol  
9
148,100.00 kJ/mol  
1
30th Energy Level
880.00 kJ/mol  
6
154,500.00 kJ/mol  
1
Electrochemical Equivalent
1.14 g/amp-hr  
99+
0.89 g/amp-hr  
99+
Electron Work Function
4.55 eV  
18
4.60 eV  
17
Other Chemical Properties
Flammable, Ionization, Radioactive Isotopes, Radioactivity  
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
77  
39
42  
99+
Electron Configuration
[Xe] 4f14 5d7 6s2  
[Kr] 4d5 5s1  
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+
42  
99+
Number of Neutrons
110  
28
54  
99+
Number of Electrons
74  
99+
42  
99+
Radius of an Atom
  
  
Atomic Radius
136.00 pm  
99+
139.00 pm  
99+
Covalent Radius
141.00 pm  
99+
154.00 pm  
34
Van der Waals Radius
202.00 pm  
34
200.00 pm  
35
Atomic Weight
192.22 amu  
34
95.95 amu  
99+
Atomic Volume
9.53 cm3/mol  
99+
9.40 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Osmium
  
Niobium
  
Next Element
Platinum
  
Technetium
  
Valence Electron Potential
140.00 (-eV)  
5
88.60 (-eV)  
13
Lattice Constant
383.90 pm  
29
314.70 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.58  
35
1.03  
99+
Mechanical
Density
  
  
Density At Room Temperature
22.56 g/cm3  
10
10.28 g/cm3  
39
Density When Liquid (at m.p.)
19.00 g/cm3  
13
9.33 g/cm3  
99+
Tensile Strength
2,000.00 MPa  
2
324.00 MPa  
15
Viscosity
0.00  
21
0.00  
5
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
26
0.00 (Pa)  
27
Elasticity properties
  
  
Shear Modulus
210.00 GPa  
2
126.00 GPa  
8
Bulk Modulus
320.00 GPa  
3
230.00 GPa  
6
Young's Modulus
528.00 GPa  
1
329.00 GPa  
6
Poisson Ratio
0.26  
22
0.31  
13
Other Mechanical Properties
-  
Ductile, Weldable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
21.78  
12
10.22  
40
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
16
0.00 H/m  
9
Susceptibility
0.00  
5
0.00  
29
Electrical Properties
  
  
Electrical Property
Conductor  
Semiconductor  
Resistivity
47.10 nΩ·m  
99+
53.40 nΩ·m  
99+
Electrical Conductivity
0.19 106/cm Ω  
10
0.19 106/cm Ω  
11
Electron Affinity
151.00 kJ/mol  
4
71.90 kJ/mol  
16
Thermal
Specific Heat
0.13 J/(kg K)  
40
0.25 J/(kg K)  
21
Molar Heat Capacity
25.10 J/mol·K  
99+
24.06 J/mol·K  
99+
Thermal Conductivity
147.00 W/m·K  
10
138.00 W/m·K  
12
Critical Temperature
2,719.00 K  
8
2,896.00 K  
6
Thermal Expansion
6.40 µm/(m·K)  
99+
4.80 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
799.10 kJ/mol  
1
594.10 kJ/mol  
9
Enthalpy of Fusion
35.23 kJ/mol  
1
27.61 kJ/mol  
5
Enthalpy of Atomization
837.00 kJ/mol  
1
653.00 kJ/mol  
7
Standard Molar Entropy
35.50 J/mol.K  
99+
28.70 J/mol.K  
99+
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