Iridium vs Platinum
Periodic Table
Symbol
Ir
Pt
Group Number
9
9
10
8
Period Number
6
6
Block
d block
d block
Element Family
Transition Metal
Transition Metal
CAS Number
7439885
99+
7440064
99+
Space Group Name
Fm_ 3m
Fm_ 3m
Space Group Number
225.00
2
225.00
2
Facts
Interesting Facts
- Iridium element occurs as natural alloys of Platinum and Osmium.
- Iridium element is known as the most corrosion resistance metal .
- Platinum is the rarest metal from the Precious metal categories..
- Commercially Platinum is produced as a byproduct in ores of nickel.
Sources
Found in Minerals, Mining, Ores of Minerals
Mining, Ores of metals, Ores of Minerals
History
Who Discovered
Smithson Tennant
Antonio de Ulloa
Discovery
In 1803
In 1735
Abundance
Abundance In Universe
2 * 10-7 %
22
5 * 10-7 %
19
Abundance In Sun
~0.0000002 %
25
~0.0000009 %
19
Abundance In Meteorites
0.00 %
29
0.00 %
25
Abundance In Earth's Crust
0.00 %
99+
0.00 %
99+
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.
- Platinum metal is mainly used in jewellery.
- Platinum is used as an industrial catalyst in production of nitric acid, silicone and benzene.
Industrial Uses
Automobile Industry, Electrical Industry, Electronic Industry
Aerospace Industry, Chemical Industry
Medical Uses
NA
Dentistry, Pharmaceutical Industry, Surgical Instruments Manufacturing
Other Uses
Alloys
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues
Biological Properties
Toxicity
Toxic
Non Toxic
Present in Human Body
Yes
No
Physical Properties
Melting Point
2,410.00 °C
7
1,772.00 °C
16
Boiling Point
4,527.00 °C
10
3,827.00 °C
15
Appearance
Physical State
Solid
Solid
Color
Silvery White
Silvery White
Luster
Metallic
Metallic
Hardness
Mohs Hardness
6.50
5
3.50
11
Brinell Hardness
1,670.00 MPa
5
300.00 MPa
34
Vickers Hardness
1,760.00 MPa
3
400.00 MPa
25
Speed of Sound
4,825.00 m/s
13
2,800.00 m/s
29
Optical Properties
Reflectivity
78.00 %
6
73.00 %
8
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
Pt
Isotopes
Known Isotopes
34
5
35
4
Electronegativity
Pauling Electronegativity
2.20
4
2.28
3
Allred Rochow Electronegativity
1.55
11
1.44
17
Allen Electronegativity
1.68
17
1.72
16
Electropositivity
Pauling Electropositivity
1.80
99+
1.72
99+
Ionization Energies
1st Energy Level
880.00 kJ/mol
9
870.00 kJ/mol
10
2nd Energy Level
1,600.00 kJ/mol
35
1,791.00 kJ/mol
21
Electrochemical Equivalent
1.14 g/amp-hr
99+
1.82 g/amp-hr
35
Electron Work Function
4.55 eV
13
5.65 eV
1
Other Chemical Properties
Flammable, Ionization, Radioactive Isotopes, Radioactivity
Chemical Stability, Anti Corrosion, Ionization
Atomic Properties
Atomic Number
77
39
78
38
Electron Configuration
[Xe] 4f14 5d7 6s2
[Xe] 4f14 5d9 6s1
Crystal Structure
Face Centered Cubic (FCC)
Face Centered Cubic (FCC)
Crystal Lattice
FCC-Crystal-Structure-of-Iridium.jpg#100
FCC-Crystal-Structure-of-Platinum.jpg#100
Atom
Number of Protons
74
99+
78
38
Number of Neutrons
110
27
117
24
Number of Electrons
74
99+
78
38
Radius of an Atom
Atomic Radius
136.00 pm
99+
139.00 pm
39
Covalent Radius
141.00 pm
99+
136.00 pm
99+
Van der Waals Radius
202.00 pm
27
175.00 pm
36
Atomic Weight
192.22 amu
34
47.87 amu
99+
Atomic Volume
9.53 cm3/mol
99+
9.09 cm3/mol
99+
Adjacent Atomic Numbers
Valence Electron Potential
140.00 (-eV)
5
392.42 (-eV)
1
Lattice Constant
383.90 pm
26
392.42 pm
24
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
21.45 g/cm3
11
Density When Liquid (at m.p.)
19.00 g/cm3
3
19.77 g/cm3
2
Tensile Strength
2,000.00 MPa
2
125.00 MPa
14
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
0.00 (Pa)
25
0.07 (Pa)
18
Elasticity properties
Shear Modulus
210.00 GPa
2
61.00 GPa
14
Bulk Modulus
320.00 GPa
3
230.00 GPa
6
Young's Modulus
528.00 GPa
1
168.00 GPa
14
Poisson Ratio
0.26
22
0.38
6
Other Mechanical Properties
NA
Ductile, Malleable
Magnetic Properties
Magnetic Characteristics
Specific Gravity
21.78
3
21.45
4
Magnetic Ordering
Paramagnetic
Paramagnetic
Permeability
Not Available
0.00 H/m
3
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
47.10 nΩ·m
99+
105.00 nΩ·m
30
Electrical Conductivity
0.19 106/cm Ω
10
0.10 106/cm Ω
21
Electron Affinity
151.00 kJ/mol
4
205.30 kJ/mol
2
Thermal Properties
Specific Heat
0.13 J/(kg K)
39
0.13 J/(kg K)
39
Molar Heat Capacity
25.10 J/mol·K
99+
25.86 J/mol·K
35
Thermal Conductivity
147.00 W/m·K
10
71.60 W/m·K
24
Critical Temperature
Not Available
Not Available
Thermal Expansion
6.40 µm/(m·K)
99+
8.80 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
799.10 kJ/mol
1
510.50 kJ/mol
11
Enthalpy of Fusion
35.23 kJ/mol
1
19.70 kJ/mol
12
Enthalpy of Atomization
837.00 kJ/mol
1
565.00 kJ/mol
11
Standard Molar Entropy
35.50 J/mol.K
99+
41.60 J/mol.K
36
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