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Chromium vs Rhodium

Chromium
Rhodium
Rhodium vs Chromium


Periodic Table
Symbol
Cr   
Rh   
Group Number
6   
12
9   
9
Period Number
4   
5   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7440473   
39
7440166   
99+
Space Group Name
Im_ 3m   
Fm_ 3m   
Space Group Number
229.00   
1
225.00   
2
Facts
Interesting Facts
  • Chromium is highly reactive, hence it is not found free in nature.
  • Ores of Chromites mineral are the major source of Chromium metal.
  • Almost 90% leather tanning is done with the help of chromium.
  
  • 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
Found in Minerals, Mining, Ores of metals, Ores of Minerals   
Earth's crust, Found As a By-product, Found in Minerals, Mining   
History
  
  
Who Discovered
Louis Nicolas Vauquelin   
William Hyde Wollaston   
Discovery
In Between 1797 - 1798   
In 1804   
Abundance
  
  
Abundance In Universe
1.5 * 10-3 %   
7
6 * 10-8 %   
26
Abundance In Sun
~0.002 %   
7
~0.0000002 %   
25
Abundance In Meteorites
0.30 %   
7
0.00 %   
36
Abundance In Earth's Crust
0.01 %   
13
0.00 %   
99+
Abundance In Oceans
0.00 %   
16
Not Available   
Abundance In Humans
0.00 %   
16
Not Available   
Uses
Uses & Benefits
  • It is used to harden the steel and produces a stainless steel and other various alloys.
  • It is also used to give proper finish to polished mirrors. Its chromium plates are used in bathroom fittings.
  
  • 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
Automobile Industry, Chemical Industry   
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys   
Alloys   
Biological Properties
  
  
Toxicity
Highly Toxic   
NA   
Present in Human Body
Yes   
No   
In Blood
0.11 Blood/mg dm-3   
12
Not Available   
In Bone
0.33 p.p.m.   
21
Not Available   
Physical Properties
Melting Point
1,857.00 °C   
14
1,966.00 °C   
12
Boiling Point
2,672.00 °C   
39
3,727.00 °C   
17
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silvery White   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
8.50   
1
6.00   
6
Brinell Hardness
687.00 MPa   
16
980.00 MPa   
9
Vickers Hardness
1,060.00 MPa   
10
1,100.00 MPa   
9
Speed of Sound
5,940.00 m/s   
5
4,700.00 m/s   
15
Optical Properties
  
  
Reflectivity
Not Available   
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
Cr   
Rh   
Isotopes
  
  
Known Isotopes
21   
18
16   
23
Electronegativity
  
  
Pauling Electronegativity
1.66   
18
2.28   
3
Sanderson Electronegativity
1.66   
14
Not Available   
Allred Rochow Electronegativity
1.56   
10
1.45   
16
Allen Electronegativity
1.65   
19
1.56   
24
Electropositivity
  
  
Pauling Electropositivity
2.34   
36
1.72   
99+
Ionization Energies
  
  
1st Energy Level
26,130.00 kJ/mol   
1
719.70 kJ/mol   
29
2nd Energy Level
28,750.00 kJ/mol   
1
1,740.00 kJ/mol   
26
3rd Energy Level
34,230.00 kJ/mol   
1
2,997.00 kJ/mol   
27
4th Energy Level
37,066.00 kJ/mol   
1
Not Available   
5th Energy Level
97,510.00 kJ/mol   
1
Not Available   
6th Energy Level
105,800.00 kJ/mol   
1
Not Available   
7th Energy level
114,300.00 kJ/mol   
1
Not Available   
8th Energy Level
125,300.00 kJ/mol   
1
Not Available   
9th Energy Level
134,700.00 kJ/mol   
1
Not Available   
10th Energy Level
144,300.00 kJ/mol   
1
Not Available   
11th Energy Level
26,130.00 kJ/mol   
12
Not Available   
12th Energy Level
28,750.00 kJ/mol   
13
Not Available   
13th Energy Level
34,230.00 kJ/mol   
10
Not Available   
14th Energy Level
37,066.00 kJ/mol   
12
Not Available   
15th Energy Level
97,510.00 kJ/mol   
1
Not Available   
16th Energy Level
105,800.00 kJ/mol   
2
Not Available   
17th Energy Level
114,300.00 kJ/mol   
3
Not Available   
18th Energy Level
125,300.00 kJ/mol   
4
Not Available   
19th Energy Level
134,700.00 kJ/mol   
5
Not Available   
20th Energy Level
144,300.00 kJ/mol   
7
Not Available   
21st Energy Level
157,700.00 kJ/mol   
7
Not Available   
22nd Energy Level
166,090.00 kJ/mol   
6
Not Available   
Electrochemical Equivalent
0.32 g/amp-hr   
99+
1.28 g/amp-hr   
99+
Electron Work Function
4.50 eV   
14
4.98 eV   
6
Other Chemical Properties
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility   
Anti Corrosion, Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
24   
99+
45   
99+
Electron Configuration
[Ar] 3d5 4s1   
[Kr] 4d8 5s1   
Crystal Structure
Body Centered Cubic (BCC)   
Face Centered Cubic (FCC)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
FCC-Crystal-Structure-of-Rhodium.jpg#100   
Atom
  
  
Number of Protons
24   
99+
45   
99+
Number of Neutrons
28   
99+
58   
99+
Number of Electrons
24   
99+
45   
99+
Radius of an Atom
  
  
Atomic Radius
128.00 pm   
99+
134.00 pm   
99+
Covalent Radius
139.00 pm   
99+
142.00 pm   
99+
Van der Waals Radius
200.00 pm   
28
200.00 pm   
28
Atomic Weight
52.00 amu   
99+
102.91 amu   
99+
Atomic Volume
7.23 cm3/mol   
99+
8.30 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Vanadium
  
Ruthenium
  
Next Element
Manganese
  
Palladium
  
Valence Electron Potential
170.00 (-eV)   
4
64.00 (-eV)   
22
Lattice Constant
291.00 pm   
99+
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
7.19 g/cm3   
99+
12.41 g/cm3   
28
Density When Liquid (at m.p.)
6.30 g/cm3   
40
10.70 g/cm3   
14
Tensile Strength
689.00 MPa   
7
951.00 MPa   
5
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
24
Not Available   
Vapor Pressure at 2000 K
774.00 (Pa)   
1
0.02 (Pa)   
19
Elasticity properties
  
  
Shear Modulus
115.00 GPa   
9
150.00 GPa   
6
Bulk Modulus
160.00 GPa   
11
275.00 GPa   
5
Young's Modulus
279.00 GPa   
8
380.00 GPa   
5
Poisson Ratio
0.21   
32
0.26   
22
Other Mechanical Properties
NA   
Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
7.19   
99+
12.41   
20
Magnetic Ordering
Antiferromagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
NA   
Conductor   
Resistivity
125.00 nΩ·m   
27
43.30 nΩ·m   
99+
Electrical Conductivity
0.08 106/cm Ω   
25
0.21 106/cm Ω   
8
Electron Affinity
64.30 kJ/mol   
15
109.70 kJ/mol   
7
Thermal Properties
Specific Heat
0.45 J/(kg K)   
12
0.24 J/(kg K)   
22
Molar Heat Capacity
23.35 J/mol·K   
99+
24.98 J/mol·K   
99+
Thermal Conductivity
93.90 W/m·K   
17
150.00 W/m·K   
9
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
4.90 µm/(m·K)   
99+
8.20 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
348.80 kJ/mol   
24
495.40 kJ/mol   
12
Enthalpy of Fusion
15.31 kJ/mol   
20
21.76 kJ/mol   
10
Enthalpy of Atomization
397.50 kJ/mol   
21
556.50 kJ/mol   
12
Standard Molar Entropy
23.80 J/mol.K   
99+
31.50 J/mol.K   
99+
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