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Rhodium vs Chromium

Rhodium
Chromium
Chromium vs Rhodium


Periodic Table
Symbol
Rh   
Cr   
Group Number
9   
9
6   
12
Period Number
5   
4   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7440166   
99+
7440473   
39
Space Group Name
Fm_ 3m   
Im_ 3m   
Space Group Number
225.00   
2
229.00   
1
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.
  
  • 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.
  
Sources
Earth's crust, Found As a By-product, Found in Minerals, Mining   
Found in Minerals, Mining, Ores of metals, Ores of Minerals   
History
  
  
Who Discovered
William Hyde Wollaston   
Louis Nicolas Vauquelin   
Discovery
In 1804   
In Between 1797 - 1798   
Abundance
  
  
Abundance In Universe
6 * 10-8 %   
26
1.5 * 10-3 %   
7
Abundance In Sun
~0.0000002 %   
25
~0.002 %   
7
Abundance In Meteorites
0.00 %   
36
0.30 %   
7
Abundance In Earth's Crust
0.00 %   
99+
0.01 %   
13
Abundance In Oceans
Not Available   
0.00 %   
16
Abundance In Humans
Not Available   
0.00 %   
16
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 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.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Automobile Industry, Chemical Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys   
Alloys   
Biological Properties
  
  
Toxicity
NA   
Highly Toxic   
Present in Human Body
No   
Yes   
In Blood
Not Available   
0.11 Blood/mg dm-3   
12
In Bone
Not Available   
0.33 p.p.m.   
21
Physical Properties
Melting Point
1,966.00 °C   
12
1,857.00 °C   
14
Boiling Point
3,727.00 °C   
17
2,672.00 °C   
39
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery White   
Silver   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
6.00   
6
8.50   
1
Brinell Hardness
980.00 MPa   
9
687.00 MPa   
16
Vickers Hardness
1,100.00 MPa   
9
1,060.00 MPa   
10
Speed of Sound
4,700.00 m/s   
15
5,940.00 m/s   
5
Optical Properties
  
  
Reflectivity
84.00 %   
4
Not Available   
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   
Cr   
Isotopes
  
  
Known Isotopes
16   
23
21   
18
Electronegativity
  
  
Pauling Electronegativity
2.28   
3
1.66   
18
Sanderson Electronegativity
Not Available   
1.66   
14
Allred Rochow Electronegativity
1.45   
16
1.56   
10
Allen Electronegativity
1.56   
24
1.65   
19
Electropositivity
  
  
Pauling Electropositivity
1.72   
99+
2.34   
36
Ionization Energies
  
  
1st Energy Level
719.70 kJ/mol   
29
26,130.00 kJ/mol   
1
2nd Energy Level
1,740.00 kJ/mol   
26
28,750.00 kJ/mol   
1
3rd Energy Level
2,997.00 kJ/mol   
27
34,230.00 kJ/mol   
1
4th Energy Level
Not Available   
37,066.00 kJ/mol   
1
5th Energy Level
Not Available   
97,510.00 kJ/mol   
1
6th Energy Level
Not Available   
105,800.00 kJ/mol   
1
7th Energy level
Not Available   
114,300.00 kJ/mol   
1
8th Energy Level
Not Available   
125,300.00 kJ/mol   
1
9th Energy Level
Not Available   
134,700.00 kJ/mol   
1
10th Energy Level
Not Available   
144,300.00 kJ/mol   
1
11th Energy Level
Not Available   
26,130.00 kJ/mol   
12
12th Energy Level
Not Available   
28,750.00 kJ/mol   
13
13th Energy Level
Not Available   
34,230.00 kJ/mol   
10
14th Energy Level
Not Available   
37,066.00 kJ/mol   
12
15th Energy Level
Not Available   
97,510.00 kJ/mol   
1
16th Energy Level
Not Available   
105,800.00 kJ/mol   
2
17th Energy Level
Not Available   
114,300.00 kJ/mol   
3
18th Energy Level
Not Available   
125,300.00 kJ/mol   
4
19th Energy Level
Not Available   
134,700.00 kJ/mol   
5
20th Energy Level
Not Available   
144,300.00 kJ/mol   
7
21st Energy Level
Not Available   
157,700.00 kJ/mol   
7
22nd Energy Level
Not Available   
166,090.00 kJ/mol   
6
Electrochemical Equivalent
1.28 g/amp-hr   
99+
0.32 g/amp-hr   
99+
Electron Work Function
4.98 eV   
6
4.50 eV   
14
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes   
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
45   
99+
24   
99+
Electron Configuration
[Kr] 4d8 5s1   
[Ar] 3d5 4s1   
Crystal Structure
Face Centered Cubic (FCC)   
Body Centered Cubic (BCC)   
Crystal Lattice
FCC-Crystal-Structure-of-Rhodium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
45   
99+
24   
99+
Number of Neutrons
58   
99+
28   
99+
Number of Electrons
45   
99+
24   
99+
Radius of an Atom
  
  
Atomic Radius
134.00 pm   
99+
128.00 pm   
99+
Covalent Radius
142.00 pm   
99+
139.00 pm   
99+
Van der Waals Radius
200.00 pm   
28
200.00 pm   
28
Atomic Weight
102.91 amu   
99+
52.00 amu   
99+
Atomic Volume
8.30 cm3/mol   
99+
7.23 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Ruthenium
  
Vanadium
  
Next Element
Palladium
  
Manganese
  
Valence Electron Potential
64.00 (-eV)   
22
170.00 (-eV)   
4
Lattice Constant
380.34 pm   
27
291.00 pm   
99+
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
7.19 g/cm3   
99+
Density When Liquid (at m.p.)
10.70 g/cm3   
14
6.30 g/cm3   
40
Tensile Strength
951.00 MPa   
5
689.00 MPa   
7
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
24
Vapor Pressure at 2000 K
0.02 (Pa)   
19
774.00 (Pa)   
1
Elasticity properties
  
  
Shear Modulus
150.00 GPa   
6
115.00 GPa   
9
Bulk Modulus
275.00 GPa   
5
160.00 GPa   
11
Young's Modulus
380.00 GPa   
5
279.00 GPa   
8
Poisson Ratio
0.26   
22
0.21   
32
Other Mechanical Properties
Malleable   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
12.41   
20
7.19   
99+
Magnetic Ordering
Paramagnetic   
Antiferromagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
NA   
Resistivity
43.30 nΩ·m   
99+
125.00 nΩ·m   
27
Electrical Conductivity
0.21 106/cm Ω   
8
0.08 106/cm Ω   
25
Electron Affinity
109.70 kJ/mol   
7
64.30 kJ/mol   
15
Thermal Properties
Specific Heat
0.24 J/(kg K)   
22
0.45 J/(kg K)   
12
Molar Heat Capacity
24.98 J/mol·K   
99+
23.35 J/mol·K   
99+
Thermal Conductivity
150.00 W/m·K   
9
93.90 W/m·K   
17
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
8.20 µm/(m·K)   
99+
4.90 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
495.40 kJ/mol   
12
348.80 kJ/mol   
24
Enthalpy of Fusion
21.76 kJ/mol   
10
15.31 kJ/mol   
20
Enthalpy of Atomization
556.50 kJ/mol   
12
397.50 kJ/mol   
21
Standard Molar Entropy
31.50 J/mol.K   
99+
23.80 J/mol.K   
99+
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