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Chromium vs Manganese

Chromium
Manganese
Manganese vs Chromium


Periodic Table
Symbol
Cr  
Mn  
Group Number
6  
12
7  
11
Period Number
4  
4  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7440473  
39
7439965  
99+
Space Group Name
Im_ 3m  
I_ 43m  
Space Group Number
229.00  
1
217.00  
4
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.
  
  • Manganese is an essential trace element in all forms of life.
  • Manganese metal oxidizes very easily, but it does not fuse that easily.
  
Sources
Found in Minerals, Mining, Ores of metals, Ores of Minerals  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Louis Nicolas Vauquelin  
Johann Gottlieb Gahn  
Discovery
In Between 1797 - 1798  
In 1774  
Abundance
  
  
Abundance In Universe
1.5 * 10-3 %  
7
8 * 10-4 %  
8
Abundance In Sun
~0.002 %  
7
~0.001 %  
8
Abundance In Meteorites
0.30 %  
7
0.27 %  
8
Abundance In Earth's Crust
0.01 %  
13
0.11 %  
8
Abundance In Oceans
0.00 %  
16
0.00 %  
13
Abundance In Humans
0.00 %  
16
0.00 %  
13
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.
  
  • This metal is very brittle hence it mostly not used as a pure metal, but its alloys are very useful
  • Its alloy Manganese steel is extremely strong and used in railway tracks, safes, prison bars and riffle barrels.
  
Industrial Uses
Automobile Industry, Chemical Industry  
Automobile Industry, Electrical Industry, Electronic Industry  
Medical Uses
NA  
NA  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Highly Toxic  
Toxic  
Present in Human Body
Yes  
Yes  
In Blood
0.11 Blood/mg dm-3  
12
0.08 Blood/mg dm-3  
14
In Bone
0.33 p.p.m.  
21
100.00 p.p.m.  
8
Physical Properties
Melting Point
1,857.00 °C  
14
1,245.00 °C  
37
Boiling Point
2,672.00 °C  
39
1,962.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silver  
Silver  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
8.50  
1
6.00  
6
Brinell Hardness
687.00 MPa  
16
196.00 MPa  
99+
Vickers Hardness
1,060.00 MPa  
10
Not Available  
Speed of Sound
5,940.00 m/s  
5
5,150.00 m/s  
7
Optical Properties
  
  
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  
Mn  
Isotopes
  
  
Known Isotopes
21  
18
21  
18
Electronegativity
  
  
Pauling Electronegativity
1.66  
18
1.55  
25
Sanderson Electronegativity
1.66  
14
2.20  
7
Allred Rochow Electronegativity
1.56  
10
1.60  
9
Allen Electronegativity
1.65  
19
1.75  
15
Electropositivity
  
  
Pauling Electropositivity
2.34  
36
2.45  
29
Ionization Energies
  
  
1st Energy Level
26,130.00 kJ/mol  
1
717.30 kJ/mol  
30
2nd Energy Level
28,750.00 kJ/mol  
1
1,509.00 kJ/mol  
39
3rd Energy Level
34,230.00 kJ/mol  
1
3,248.00 kJ/mol  
21
4th Energy Level
37,066.00 kJ/mol  
1
4,940.00 kJ/mol  
20
5th Energy Level
97,510.00 kJ/mol  
1
6,990.00 kJ/mol  
17
6th Energy Level
105,800.00 kJ/mol  
1
9,220.00 kJ/mol  
16
7th Energy level
114,300.00 kJ/mol  
1
11,500.00 kJ/mol  
16
8th Energy Level
125,300.00 kJ/mol  
1
18,770.00 kJ/mol  
5
9th Energy Level
134,700.00 kJ/mol  
1
21,400.00 kJ/mol  
6
10th Energy Level
144,300.00 kJ/mol  
1
23,960.00 kJ/mol  
9
11th Energy Level
26,130.00 kJ/mol  
12
27,590.00 kJ/mol  
10
12th Energy Level
28,750.00 kJ/mol  
13
30,330.00 kJ/mol  
10
13th Energy Level
34,230.00 kJ/mol  
10
33,150.00 kJ/mol  
11
14th Energy Level
37,066.00 kJ/mol  
12
38,880.00 kJ/mol  
10
15th Energy Level
97,510.00 kJ/mol  
1
41,987.00 kJ/mol  
13
16th Energy Level
105,800.00 kJ/mol  
2
109,480.00 kJ/mol  
1
17th Energy Level
114,300.00 kJ/mol  
3
118,100.00 kJ/mol  
2
18th Energy Level
125,300.00 kJ/mol  
4
127,100.00 kJ/mol  
3
19th Energy Level
134,700.00 kJ/mol  
5
138,600.00 kJ/mol  
4
20th Energy Level
144,300.00 kJ/mol  
7
148,500.00 kJ/mol  
6
21st Energy Level
157,700.00 kJ/mol  
7
158,600.00 kJ/mol  
6
22nd Energy Level
166,090.00 kJ/mol  
6
172,500.00 kJ/mol  
5
23rd Energy Level
Not Available  
181,380.00 kJ/mol  
5
Electrochemical Equivalent
0.32 g/amp-hr  
99+
0.29 g/amp-hr  
99+
Electron Work Function
4.50 eV  
14
4.10 eV  
25
Other Chemical Properties
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes  
Atomic Properties
Atomic Number
24  
99+
25  
99+
Electron Configuration
[Ar] 3d5 4s1  
[Ar] 3d5 4s2  
Crystal Structure
Body Centered Cubic (BCC)  
Body Centered Cubic (BCC)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
24  
99+
25  
99+
Number of Neutrons
28  
99+
30  
99+
Number of Electrons
24  
99+
25  
99+
Radius of an Atom
  
  
Atomic Radius
128.00 pm  
99+
127.00 pm  
99+
Covalent Radius
139.00 pm  
99+
139.00 pm  
99+
Van der Waals Radius
200.00 pm  
28
200.00 pm  
28
Atomic Weight
52.00 amu  
99+
54.94 amu  
99+
Atomic Volume
7.23 cm3/mol  
99+
1.39 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Vanadium
  
Chromium
  
Next Element
Manganese
  
Iron
  
Valence Electron Potential
170.00 (-eV)  
4
220.00 (-eV)  
2
Lattice Constant
291.00 pm  
99+
891.25 pm  
1
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+
7.21 g/cm3  
99+
Density When Liquid (at m.p.)
6.30 g/cm3  
40
5.95 g/cm3  
99+
Tensile Strength
689.00 MPa  
7
Not Available  
Viscosity
Not Available  
Not Available  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
24
0.00 (Pa)  
12
Vapor Pressure at 2000 K
774.00 (Pa)  
1
Not Available  
Elasticity properties
  
  
Shear Modulus
115.00 GPa  
9
Not Available  
Bulk Modulus
160.00 GPa  
11
120.00 GPa  
14
Young's Modulus
279.00 GPa  
8
198.00 GPa  
12
Poisson Ratio
0.21  
32
Not Available  
Other Mechanical Properties
NA  
NA  
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
7.19  
99+
7.21  
99+
Magnetic Ordering
Antiferromagnetic  
Paramagnetic  
Electrical Properties
  
  
Electrical Property
NA  
Conductor  
Resistivity
125.00 nΩ·m  
27
1.44 nΩ·m  
99+
Electrical Conductivity
0.08 106/cm Ω  
25
0.01 106/cm Ω  
99+
Electron Affinity
64.30 kJ/mol  
15
0.00 kJ/mol  
40
Thermal Properties
Specific Heat
0.45 J/(kg K)  
12
0.48 J/(kg K)  
11
Molar Heat Capacity
23.35 J/mol·K  
99+
26.32 J/mol·K  
29
Thermal Conductivity
93.90 W/m·K  
17
7.81 W/m·K  
99+
Critical Temperature
Not Available  
Not Available  
Thermal Expansion
4.90 µm/(m·K)  
99+
21.70 µm/(m·K)  
21
Enthalpy
  
  
Enthalpy of Vaporization
348.80 kJ/mol  
24
219.70 kJ/mol  
99+
Enthalpy of Fusion
15.31 kJ/mol  
20
14.64 kJ/mol  
23
Enthalpy of Atomization
397.50 kJ/mol  
21
280.30 kJ/mol  
38
Standard Molar Entropy
23.80 J/mol.K  
99+
32.00 J/mol.K  
99+
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