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Rhodium vs Platinum

Rhodium
Platinum
Platinum vs Rhodium


Periodic Table
Symbol
Rh  
Pt  
Group Number
9  
9
10  
8
Period Number
5  
6  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7440166  
99+
7440064  
99+
Space Group Name
Fm_ 3m  
Fm_ 3m  
Space Group Number
225.00  
3
225.00  
3
Facts
Interesting Facts
  • Rhodium is the rarest element out of all non-radioactive metals on the earth .
  • Rhodium is one of the most durable and hard metal, which also have high reflectance.
  
  • Platinum is the rarest metal from the Precious metal categories..
  • Commercially Platinum is produced as a byproduct in ores of nickel.
  
Sources
Earth's crust, Found As a By-product, Found in Minerals, Mining  
Mining, Ores of metals, Ores of Minerals  
History
  
  
Who Discovered
William Hyde Wollaston  
Antonio de Ulloa  
Discovery
In 1804  
In 1735  
Abundance
  
  
Abundance In Universe
0.00 %  
27
0.00 %  
20
Abundance In Sun
0.00 %  
25
0.00 %  
19
Abundance In Meteorites
0.00 %  
36
0.00 %  
25
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
-  
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Rhodium metal is mainly used in catalytic converters for cars as it reduces nitrogen oxides in exhaust gases.
  • It is used as an industrial catalyst for nitric acid, acetic acid, hydrogenation reaction, etc.
  
  • Platinum metal is mainly used in jewellery.
  • Platinum is used as an industrial catalyst in production of nitric acid, silicone and benzene.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
Aerospace Industry, Chemical Industry  
Medical Uses
-  
Dentistry, Pharmaceutical Industry, Surgical Instruments Manufacturing  
Other Uses
Alloys  
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues  
Biological Properties
  
  
Toxicity
-  
Non Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
37
0.00 Blood/mg dm-3  
37
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
1,966.00 °C  
12
1,772.00 °C  
16
Boiling Point
3,727.00 °C  
17
3,827.00 °C  
15
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
3.50  
12
Brinell Hardness
980.00 MPa  
10
300.00 MPa  
99+
Vickers Hardness
1,100.00 MPa  
15
400.00 MPa  
99+
Speed of Sound
4,700.00 m/s  
19
2,800.00 m/s  
99+
Optical Properties
  
  
Refractive Index
2.40  
7
2.41  
6
Reflectivity
84.00 %  
5
73.00 %  
10
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Rh  
Pt  
Isotopes
  
  
Known Isotopes
16  
23
35  
4
Electronegativity
  
  
Pauling Electronegativity
2.28  
4
2.28  
4
Sanderson Electronegativity
2.28  
5
2.28  
5
Allred Rochow Electronegativity
1.45  
17
1.44  
18
Mulliken-Jaffe Electronegativity
2.28  
4
2.20  
6
Allen Electronegativity
1.56  
27
1.72  
19
Electropositivity
  
  
Pauling Electropositivity
1.72  
99+
1.72  
99+
Ionization Energies
  
  
1st Energy Level
719.70 kJ/mol  
29
870.00 kJ/mol  
10
2nd Energy Level
1,740.00 kJ/mol  
27
1,791.00 kJ/mol  
22
3rd Energy Level
2,997.00 kJ/mol  
27
2,277.00 kJ/mol  
99+
4th Energy Level
7,197.00 kJ/mol  
11
8,702.00 kJ/mol  
6
5th Energy Level
7,197.00 kJ/mol  
26
8,702.00 kJ/mol  
9
6th Energy Level
7,197.00 kJ/mol  
40
8,700.00 kJ/mol  
27
7th Energy level
7,197.00 kJ/mol  
35
8,700.00 kJ/mol  
23
8th Energy Level
3,480.00 kJ/mol  
99+
8,700.00 kJ/mol  
23
9th Energy Level
5,090.00 kJ/mol  
99+
5,660.00 kJ/mol  
99+
10th Energy Level
7,197.00 kJ/mol  
33
8,700.00 kJ/mol  
24
11th Energy Level
7,197.00 kJ/mol  
32
8,700.00 kJ/mol  
21
12th Energy Level
7,190.00 kJ/mol  
99+
8,700.00 kJ/mol  
99+
13th Energy Level
7,190.00 kJ/mol  
27
8,700.00 kJ/mol  
16
14th Energy Level
7,197.00 kJ/mol  
21
870.00 kJ/mol  
99+
15th Energy Level
71,900.00 kJ/mol  
23
87,000.00 kJ/mol  
9
16th Energy Level
71,900.00 kJ/mol  
18
870.00 kJ/mol  
99+
17th Energy Level
719.70 kJ/mol  
39
870.00 kJ/mol  
27
18th Energy Level
7,197.00 kJ/mol  
29
8,700.00 kJ/mol  
16
19th Energy Level
719.70 kJ/mol  
36
870.00 kJ/mol  
25
20th Energy Level
719.00 kJ/mol  
30
870.00 kJ/mol  
15
21st Energy Level
719.70 kJ/mol  
99+
870.00 kJ/mol  
38
22nd Energy Level
719.00 kJ/mol  
24
870.00 kJ/mol  
13
23rd Energy Level
719.70 kJ/mol  
99+
870.10 kJ/mol  
39
24th Energy Level
719.70 kJ/mol  
23
870.00 kJ/mol  
9
25th Energy Level
719.00 kJ/mol  
23
870.00 kJ/mol  
7
26th Energy Level
719.70 kJ/mol  
23
870.00 kJ/mol  
7
27th Energy Level
719.70 kJ/mol  
22
870.10 kJ/mol  
6
28th Energy Level
719.70 kJ/mol  
28
870.10 kJ/mol  
9
29th Energy Level
719.70 kJ/mol  
29
870.00 kJ/mol  
10
30th Energy Level
719.00 kJ/mol  
23
870.00 kJ/mol  
7
Electrochemical Equivalent
1.28 g/amp-hr  
99+
1.82 g/amp-hr  
39
Electron Work Function
4.98 eV  
10
5.65 eV  
4
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes  
Chemical Stability, Anti Corrosion, Ionization  
Atomic
Atomic Number
45  
99+
78  
38
Electron Configuration
[Kr] 4d8 5s1  
[Xe] 4f14 5d9 6s1  
Crystal Structure
Face Centered Cubic (FCC)  
Face Centered Cubic (FCC)  
Crystal Lattice
FCC-Crystal-Structure-of-Rhodium.jpg#100  
FCC-Crystal-Structure-of-Platinum.jpg#100  
Atom
  
  
Number of Protons
45  
99+
78  
38
Number of Neutrons
58  
99+
117  
25
Number of Electrons
45  
99+
78  
38
Radius of an Atom
  
  
Atomic Radius
134.00 pm  
99+
139.00 pm  
99+
Covalent Radius
142.00 pm  
99+
136.00 pm  
99+
Van der Waals Radius
200.00 pm  
35
175.00 pm  
99+
Atomic Weight
102.91 amu  
99+
47.87 amu  
99+
Atomic Volume
8.30 cm3/mol  
99+
9.09 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Ruthenium
  
Iridium
  
Next Element
Palladium
  
Gold
  
Valence Electron Potential
64.00 (-eV)  
22
392.42 (-eV)  
1
Lattice Constant
380.34 pm  
30
392.42 pm  
27
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.73  
7
1.56  
99+
Mechanical
Density
  
  
Density At Room Temperature
12.41 g/cm3  
30
21.45 g/cm3  
11
Density When Liquid (at m.p.)
10.70 g/cm3  
35
19.77 g/cm3  
12
Tensile Strength
951.00 MPa  
5
125.00 MPa  
26
Viscosity
0.00  
25
0.00  
16
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
16
Vapor Pressure at 2000 K
0.02 (Pa)  
19
0.07 (Pa)  
18
Elasticity properties
  
  
Shear Modulus
150.00 GPa  
6
61.00 GPa  
14
Bulk Modulus
275.00 GPa  
5
230.00 GPa  
6
Young's Modulus
380.00 GPa  
5
168.00 GPa  
15
Poisson Ratio
0.26  
22
0.38  
6
Other Mechanical Properties
Malleable  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
12.41  
32
21.45  
13
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
14
Susceptibility
0.00  
24
0.00  
20
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
43.30 nΩ·m  
99+
105.00 nΩ·m  
30
Electrical Conductivity
0.21 106/cm Ω  
8
0.10 106/cm Ω  
26
Electron Affinity
109.70 kJ/mol  
8
205.30 kJ/mol  
2
Thermal
Specific Heat
0.24 J/(kg K)  
22
0.13 J/(kg K)  
40
Molar Heat Capacity
24.98 J/mol·K  
99+
25.86 J/mol·K  
99+
Thermal Conductivity
150.00 W/m·K  
9
71.60 W/m·K  
24
Critical Temperature
2,237.00 K  
13
2,041.00 K  
19
Thermal Expansion
8.20 µm/(m·K)  
99+
8.80 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
495.40 kJ/mol  
16
510.50 kJ/mol  
15
Enthalpy of Fusion
21.76 kJ/mol  
10
19.70 kJ/mol  
12
Enthalpy of Atomization
556.50 kJ/mol  
16
565.00 kJ/mol  
15
Standard Molar Entropy
31.50 J/mol.K  
99+
41.60 J/mol.K  
99+
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