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Rhodium vs Cadmium

Rhodium
Cadmium
Cadmium vs Rhodium


Periodic Table
Symbol
Rh  
Cd  
Group Number
9  
9
12  
6
Period Number
5  
5  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7440166  
99+
7440439  
99+
Space Group Name
Fm_ 3m  
P63/mmc  
Space Group Number
225.00  
3
194.00  
7
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.
  
  • Naturally occurring minor elements include Cadmium.
  • Cadmium is released into atmosphere to control volcanic eruption and forest fires.
  • It is used for electroplating of Steel for corrosion resistance.
  • It can absorb neutrons and used in nuclear reactor to control atomic fission.
  
Sources
Earth's crust, Found As a By-product, Found in Minerals, Mining  
Found As a By-product, Found in Minerals, Mining  
History
  
  
Who Discovered
William Hyde Wollaston  
Karl Samuel Leberecht Hermann and Friedrich Stromeyer  
Discovery
In 1804  
In 1817  
Abundance
  
  
Abundance In Universe
0.00 %  
27
0.00 %  
23
Abundance In Sun
0.00 %  
25
0.00 %  
21
Abundance In Meteorites
0.00 %  
36
0.00 %  
31
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
-  
0.00 %  
28
Abundance In Humans
0.00 %  
24
0.00 %  
12
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.
  
  • It has very limited uses as it is a toxic metal and it can cause birth defects, cancer, etc.
  • Almost 80% of Cadmium metal is used in Nickel cadmium Batteries and now it is getting replaced with nickel hydride.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
Aerospace Industry, Ammunition Industry, Chemical Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
-  
Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
37
0.01 Blood/mg dm-3  
24
In Bone
0.00 p.p.m.  
99+
1.80 p.p.m.  
16
Physical
Melting Point
1,966.00 °C  
12
320.90 °C  
99+
Boiling Point
3,727.00 °C  
17
765.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silvery Bluish-Gray  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
6.00  
6
2.00  
17
Brinell Hardness
980.00 MPa  
10
203.00 MPa  
99+
Vickers Hardness
1,100.00 MPa  
15
90.00 MPa  
99+
Speed of Sound
4,700.00 m/s  
19
2,310.00 m/s  
99+
Optical Properties
  
  
Refractive Index
2.40  
7
1.71  
26
Reflectivity
84.00 %  
5
67.00 %  
16
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Rh  
Cd  
Isotopes
  
  
Known Isotopes
16  
23
34  
5
Electronegativity
  
  
Pauling Electronegativity
2.28  
4
1.69  
18
Sanderson Electronegativity
2.28  
5
1.98  
11
Allred Rochow Electronegativity
1.45  
17
1.46  
16
Mulliken-Jaffe Electronegativity
2.28  
4
1.53  
25
Allen Electronegativity
1.56  
27
1.52  
30
Electropositivity
  
  
Pauling Electropositivity
1.72  
99+
2.31  
37
Ionization Energies
  
  
1st Energy Level
719.70 kJ/mol  
29
867.80 kJ/mol  
11
2nd Energy Level
1,740.00 kJ/mol  
27
1,631.40 kJ/mol  
33
3rd Energy Level
2,997.00 kJ/mol  
27
3,616.00 kJ/mol  
13
4th Energy Level
7,197.00 kJ/mol  
11
867.80 kJ/mol  
99+
5th Energy Level
7,197.00 kJ/mol  
26
4,040.00 kJ/mol  
99+
6th Energy Level
7,197.00 kJ/mol  
40
8,640.00 kJ/mol  
28
7th Energy level
7,197.00 kJ/mol  
35
8,640.00 kJ/mol  
24
8th Energy Level
3,480.00 kJ/mol  
99+
8,640.00 kJ/mol  
24
9th Energy Level
5,090.00 kJ/mol  
99+
8,670.00 kJ/mol  
22
10th Energy Level
7,197.00 kJ/mol  
33
8,650.00 kJ/mol  
25
11th Energy Level
7,197.00 kJ/mol  
32
8,670.00 kJ/mol  
22
12th Energy Level
7,190.00 kJ/mol  
99+
86,400.00 kJ/mol  
3
13th Energy Level
7,190.00 kJ/mol  
27
8,640.00 kJ/mol  
17
14th Energy Level
7,197.00 kJ/mol  
21
8,650.00 kJ/mol  
15
15th Energy Level
71,900.00 kJ/mol  
23
86,400.00 kJ/mol  
10
16th Energy Level
71,900.00 kJ/mol  
18
86,400.00 kJ/mol  
10
17th Energy Level
719.70 kJ/mol  
39
864.90 kJ/mol  
28
18th Energy Level
7,197.00 kJ/mol  
29
8,670.00 kJ/mol  
17
19th Energy Level
719.70 kJ/mol  
36
867.80 kJ/mol  
26
20th Energy Level
719.00 kJ/mol  
30
865.00 kJ/mol  
16
21st Energy Level
719.70 kJ/mol  
99+
8,670.00 kJ/mol  
10
22nd Energy Level
719.00 kJ/mol  
24
864.00 kJ/mol  
14
23rd Energy Level
719.70 kJ/mol  
99+
864.90 kJ/mol  
40
24th Energy Level
719.70 kJ/mol  
23
864.90 kJ/mol  
10
25th Energy Level
719.00 kJ/mol  
23
864.00 kJ/mol  
8
26th Energy Level
719.70 kJ/mol  
23
864.90 kJ/mol  
8
27th Energy Level
719.70 kJ/mol  
22
864.90 kJ/mol  
8
28th Energy Level
719.70 kJ/mol  
28
864.90 kJ/mol  
11
29th Energy Level
719.70 kJ/mol  
29
864.90 kJ/mol  
12
30th Energy Level
719.00 kJ/mol  
23
864.00 kJ/mol  
8
Electrochemical Equivalent
1.28 g/amp-hr  
99+
2.10 g/amp-hr  
31
Electron Work Function
4.98 eV  
10
4.22 eV  
29
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes  
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
45  
99+
48  
99+
Electron Configuration
[Kr] 4d8 5s1  
[Kr] 4d10 5s2  
Crystal Structure
Face Centered Cubic (FCC)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
FCC-Crystal-Structure-of-Rhodium.jpg#100  
HCP-Crystal-Structure-of-Cadmium.jpg#100  
Atom
  
  
Number of Protons
45  
99+
48  
99+
Number of Neutrons
58  
99+
64  
99+
Number of Electrons
45  
99+
48  
99+
Radius of an Atom
  
  
Atomic Radius
134.00 pm  
99+
151.00 pm  
34
Covalent Radius
142.00 pm  
99+
144.00 pm  
99+
Van der Waals Radius
200.00 pm  
35
158.00 pm  
99+
Atomic Weight
102.91 amu  
99+
112.41 amu  
99+
Atomic Volume
8.30 cm3/mol  
99+
13.10 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Ruthenium
  
Silver
  
Next Element
Palladium
  
Indium
  
Valence Electron Potential
64.00 (-eV)  
22
30.00 (-eV)  
99+
Lattice Constant
380.34 pm  
30
297.94 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.73  
7
1.89  
2
Mechanical
Density
  
  
Density At Room Temperature
12.41 g/cm3  
30
8.65 g/cm3  
99+
Density When Liquid (at m.p.)
10.70 g/cm3  
35
8.00 g/cm3  
99+
Tensile Strength
951.00 MPa  
5
62.00 MPa  
34
Viscosity
0.00  
25
0.00  
13
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.02 (Pa)  
19
0.00 (Pa)  
24
Elasticity properties
  
  
Shear Modulus
150.00 GPa  
6
19.00 GPa  
99+
Bulk Modulus
275.00 GPa  
5
42.00 GPa  
34
Young's Modulus
380.00 GPa  
5
50.00 GPa  
39
Poisson Ratio
0.26  
22
0.30  
14
Other Mechanical Properties
Malleable  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
12.41  
32
8.65  
99+
Magnetic Ordering
Paramagnetic  
Diamagnetic  
Permeability
0.00 H/m  
17
0.00 H/m  
10
Susceptibility
0.00  
24
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
Semiconductor  
Resistivity
43.30 nΩ·m  
99+
72.70 nΩ·m  
36
Electrical Conductivity
0.21 106/cm Ω  
8
0.14 106/cm Ω  
17
Electron Affinity
109.70 kJ/mol  
8
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.24 J/(kg K)  
22
0.23 J/(kg K)  
26
Molar Heat Capacity
24.98 J/mol·K  
99+
26.02 J/mol·K  
40
Thermal Conductivity
150.00 W/m·K  
9
96.60 W/m·K  
16
Critical Temperature
2,237.00 K  
13
594.00 K  
99+
Thermal Expansion
8.20 µm/(m·K)  
99+
30.80 µm/(m·K)  
10
Enthalpy
  
  
Enthalpy of Vaporization
495.40 kJ/mol  
16
100.00 kJ/mol  
99+
Enthalpy of Fusion
21.76 kJ/mol  
10
6.19 kJ/mol  
99+
Enthalpy of Atomization
556.50 kJ/mol  
16
113.00 kJ/mol  
99+
Standard Molar Entropy
31.50 J/mol.K  
99+
51.80 J/mol.K  
38
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