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Palladium vs Rhodium

Palladium
Rhodium
Rhodium vs Palladium


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