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Rhodium vs Palladium

Rhodium
Palladium
Palladium vs Rhodium


Periodic Table
Symbol
Rh   
Pd   
Group Number
9   
9
10   
8
Period Number
5   
5   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7440166   
99+
7440053   
99+
Space Group Name
Fm_ 3m   
Fm_ 3m   
Space Group Number
225.00   
2
225.00   
2
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.
  
  • Palladium alloys are used for Jewelry contains (95% Palladium and 5% Ruthenium)
  • In the late 1800s, Palladium metal used have more economical value than the Platinum metal.
  • Palladium element is known as a good catalyst
  
Sources
Earth's crust, Found As a By-product, Found in Minerals, Mining   
Ores of metals   
History
  
  
Who Discovered
William Hyde Wollaston   
William Hyde Wollaston   
Discovery
In 1804   
In 1803   
Abundance
  
  
Abundance In Universe
6 * 10-8 %   
26
2 * 10-7 %   
22
Abundance In Sun
~0.0000002 %   
25
~0.0000003 %   
24
Abundance In Meteorites
0.00 %   
36
0.00 %   
99+
Abundance In Earth's Crust
0.00 %   
99+
0.00 %   
99+
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.
  
  • Mostly palladium metal is used in catalytic converters. In electronic industry it is used in ceramic capacitors of mobile and computer.
  • It is used in jewellery and dental fillings and crowns.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Aerospace Industry, Automobile Industry, Electronic Industry   
Medical Uses
NA   
Dentistry, Pharmaceutical Industry, Surgical Instruments Manufacturing   
Other Uses
Alloys   
Coinage, Bullion, Jewellery   
Biological Properties
  
  
Toxicity
NA   
Toxic   
Present in Human Body
No   
No   
Physical Properties
Melting Point
1,966.00 °C   
12
1,554.90 °C   
22
Boiling Point
3,727.00 °C   
17
2,963.00 °C   
33
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silver   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
6.00   
6
4.75   
9
Brinell Hardness
980.00 MPa   
9
320.00 MPa   
33
Vickers Hardness
1,100.00 MPa   
9
121.00 MPa   
36
Speed of Sound
4,700.00 m/s   
15
3,070.00 m/s   
26
Optical Properties
  
  
Refractive Index
Not Available   
1.72   
1
Reflectivity
84.00 %   
4
84.00 %   
4
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
Rh   
Pd   
Isotopes
  
  
Known Isotopes
16   
23
38   
1
Electronegativity
  
  
Pauling Electronegativity
2.28   
3
2.20   
4
Allred Rochow Electronegativity
1.45   
16
1.35   
21
Allen Electronegativity
1.56   
24
1.59   
22
Electropositivity
  
  
Pauling Electropositivity
1.72   
99+
1.80   
99+
Ionization Energies
  
  
1st Energy Level
719.70 kJ/mol   
29
520.23 kJ/mol   
99+
2nd Energy Level
1,740.00 kJ/mol   
26
7,298.22 kJ/mol   
2
3rd Energy Level
2,997.00 kJ/mol   
27
11,815.13 kJ/mol   
3
Electrochemical Equivalent
1.28 g/amp-hr   
99+
1.99 g/amp-hr   
30
Electron Work Function
4.98 eV   
6
5.12 eV   
3
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes   
Chemical Stability, Corrosion, Ionization, Solubility   
Atomic Properties
Atomic Number
45   
99+
46   
99+
Electron Configuration
[Kr] 4d8 5s1   
[Kr] 4d10   
Crystal Structure
Face Centered Cubic (FCC)   
Face Centered Cubic (FCC)   
Crystal Lattice
FCC-Crystal-Structure-of-Rhodium.jpg#100   
FCC-Crystal-Structure-of-Palladium.jpg#100   
Atom
  
  
Number of Protons
45   
99+
46   
99+
Number of Neutrons
58   
99+
60   
99+
Number of Electrons
45   
99+
46   
99+
Radius of an Atom
  
  
Atomic Radius
134.00 pm   
99+
137.00 pm   
40
Covalent Radius
142.00 pm   
99+
139.00 pm   
99+
Van der Waals Radius
200.00 pm   
28
163.00 pm   
40
Atomic Weight
102.91 amu   
99+
106.42 amu   
99+
Atomic Volume
8.30 cm3/mol   
99+
8.90 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Ruthenium
  
Rhodium
  
Next Element
Palladium
  
Silver
  
Valence Electron Potential
64.00 (-eV)   
22
33.00 (-eV)   
99+
Lattice Constant
380.34 pm   
27
389.07 pm   
25
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
12.41 g/cm3   
28
12.02 g/cm3   
29
Density When Liquid (at m.p.)
10.70 g/cm3   
14
10.38 g/cm3   
17
Tensile Strength
951.00 MPa   
5
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
27
Vapor Pressure at 2000 K
0.02 (Pa)   
19
0.00 (Pa)   
30
Elasticity properties
  
  
Shear Modulus
150.00 GPa   
6
44.00 GPa   
17
Bulk Modulus
275.00 GPa   
5
180.00 GPa   
9
Young's Modulus
380.00 GPa   
5
121.00 GPa   
16
Poisson Ratio
0.26   
22
0.39   
5
Other Mechanical Properties
Malleable   
Ductile, Malleable, Weldable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
12.41   
20
12.02   
21
Magnetic Ordering
Paramagnetic   
Diamagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
43.30 nΩ·m   
99+
105.40 nΩ·m   
29
Electrical Conductivity
0.21 106/cm Ω   
8
0.10 106/cm Ω   
22
Electron Affinity
109.70 kJ/mol   
7
54.23 kJ/mol   
17
Thermal Properties
Specific Heat
0.24 J/(kg K)   
22
0.24 J/(kg K)   
23
Molar Heat Capacity
24.98 J/mol·K   
99+
25.98 J/mol·K   
33
Thermal Conductivity
150.00 W/m·K   
9
71.80 W/m·K   
23
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
8.20 µm/(m·K)   
99+
11.80 µm/(m·K)   
33
Enthalpy
  
  
Enthalpy of Vaporization
495.40 kJ/mol   
12
376.60 kJ/mol   
19
Enthalpy of Fusion
21.76 kJ/mol   
10
16.74 kJ/mol   
18
Enthalpy of Atomization
556.50 kJ/mol   
12
393.30 kJ/mol   
22
Standard Molar Entropy
31.50 J/mol.K   
99+
37.60 J/mol.K   
40
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