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