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Magnesium vs Chromium

Magnesium
Chromium
Chromium vs Magnesium


Periodic Table
Symbol
Mg  
Cr  
Group Number
2  
16
6  
12
Period Number
3  
4  
Block
s block  
d block  
Element Family
Alkaline Earth  
Transition Metal  
CAS Number
7439954  
99+
7440473  
39
Space Group Name
P63/mmc  
Im_ 3m  
Space Group Number
194.00  
7
229.00  
2
Facts
Interesting Facts
  • Magnesium ions are present in every chlorophyll of every green plant .
  • Controlling Magnesium fire by pouring water on it will result in explosions.
  
  • 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
By Electrolysis Process, In Ocean, Mining  
Found in Minerals, Mining, Ores of metals, Ores of Minerals  
History
  
  
Who Discovered
Joseph Black  
Louis Nicolas Vauquelin  
Discovery
In 1755  
In Between 1797 - 1798  
Abundance
  
  
Abundance In Universe
0.06 %  
3
0.00 %  
8
Abundance In Sun
0.07 %  
2
0.00 %  
7
Abundance In Meteorites
12.00 %  
2
0.30 %  
7
Abundance In Earth's Crust
2.90 %  
4
0.01 %  
13
Abundance In Oceans
0.13 %  
2
0.00 %  
16
Abundance In Humans
0.03 %  
5
0.00 %  
19
Uses
Uses & Benefits
  • Magnesium aluminum alloy improves the mechanical strength and welding characteristics and hence it is used in aeroplane and car manufacturing.
  • It is also used to remove sulfur from the molten iron and steel.
  
  • 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, Ammunition Industry, Automobile Industry, Chemical Industry, Pharmaceutical Industry  
Automobile Industry, Chemical Industry  
Medical Uses
-  
-  
Other Uses
Surgical Instruments Manufacturing  
Alloys  
Biological Properties
  
  
Toxicity
Non Toxic  
Highly Toxic  
Present in Human Body
Yes  
Yes  
In Blood
37.80 Blood/mg dm-3  
5
0.11 Blood/mg dm-3  
12
In Bone
1,800.00 p.p.m.  
4
0.33 p.p.m.  
25
Physical
Melting Point
650.00 °C  
99+
1,857.00 °C  
14
Boiling Point
1,107.00 °C  
99+
2,672.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Gray  
Silver  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
2.50  
15
8.50  
1
Brinell Hardness
260.00 MPa  
99+
687.00 MPa  
18
Vickers Hardness
260.00 MPa  
99+
1,060.00 MPa  
17
Speed of Sound
4,940.00 m/s  
15
5,940.00 m/s  
8
Optical Properties
  
  
Refractive Index
1.49  
37
2.97  
2
Reflectivity
74.00 %  
9
70.00 %  
13
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Mg  
Cr  
Isotopes
  
  
Known Isotopes
15  
24
21  
18
Electronegativity
  
  
Pauling Electronegativity
1.31  
32
1.66  
19
Sanderson Electronegativity
1.32  
24
1.66  
17
Allred Rochow Electronegativity
1.23  
26
1.56  
11
Mulliken-Jaffe Electronegativity
1.37  
30
1.66  
19
Allen Electronegativity
1.29  
99+
1.65  
22
Electropositivity
  
  
Pauling Electropositivity
2.69  
23
2.34  
36
Ionization Energies
  
  
1st Energy Level
737.70 kJ/mol  
24
26,130.00 kJ/mol  
1
2nd Energy Level
1,450.70 kJ/mol  
99+
28,750.00 kJ/mol  
1
3rd Energy Level
7,732.70 kJ/mol  
5
34,230.00 kJ/mol  
1
4th Energy Level
10,542.50 kJ/mol  
4
37,066.00 kJ/mol  
1
5th Energy Level
13,630.00 kJ/mol  
3
97,510.00 kJ/mol  
1
6th Energy Level
18,020.00 kJ/mol  
3
105,800.00 kJ/mol  
1
7th Energy level
21,711.00 kJ/mol  
3
114,300.00 kJ/mol  
1
8th Energy Level
25,661.00 kJ/mol  
3
125,300.00 kJ/mol  
1
9th Energy Level
31,653.00 kJ/mol  
3
134,700.00 kJ/mol  
1
10th Energy Level
35,458.00 kJ/mol  
5
144,300.00 kJ/mol  
1
11th Energy Level
169,988.00 kJ/mol  
1
26,130.00 kJ/mol  
12
12th Energy Level
189,368.00 kJ/mol  
1
28,750.00 kJ/mol  
36
13th Energy Level
7,370.00 kJ/mol  
24
34,230.00 kJ/mol  
10
14th Energy Level
737.70 kJ/mol  
99+
37,066.00 kJ/mol  
12
15th Energy Level
73,700.00 kJ/mol  
21
97,510.00 kJ/mol  
2
16th Energy Level
73,770.00 kJ/mol  
16
105,800.00 kJ/mol  
2
17th Energy Level
737.70 kJ/mol  
37
114,300.00 kJ/mol  
3
18th Energy Level
7,370.00 kJ/mol  
27
125,300.00 kJ/mol  
4
19th Energy Level
737.70 kJ/mol  
34
134,700.00 kJ/mol  
5
20th Energy Level
737.00 kJ/mol  
28
144,300.00 kJ/mol  
7
21st Energy Level
737.70 kJ/mol  
99+
157,700.00 kJ/mol  
7
22nd Energy Level
738.00 kJ/mol  
22
166,090.00 kJ/mol  
6
23rd Energy Level
737.70 kJ/mol  
99+
653.80 kJ/mol  
99+
24th Energy Level
737.70 kJ/mol  
20
653.80 kJ/mol  
32
25th Energy Level
737.70 kJ/mol  
20
653.80 kJ/mol  
34
26th Energy Level
737.70 kJ/mol  
20
653.80 kJ/mol  
33
27th Energy Level
737.70 kJ/mol  
19
652.90 kJ/mol  
34
28th Energy Level
737.70 kJ/mol  
25
653.80 kJ/mol  
39
29th Energy Level
737.70 kJ/mol  
26
653.80 kJ/mol  
40
30th Energy Level
737.70 kJ/mol  
20
653.80 kJ/mol  
36
Electrochemical Equivalent
0.45 g/amp-hr  
99+
0.32 g/amp-hr  
99+
Electron Work Function
3.66 eV  
40
4.50 eV  
19
Other Chemical Properties
Corrosion, Highly Inflammable, Ionization, Solubility  
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
12  
99+
24  
99+
Electron Configuration
[Ne] 3s2  
[Ar] 3d5 4s1  
Crystal Structure
Hexagonal Close Packed (HCP)  
Body Centered Cubic (BCC)  
Crystal Lattice
HCP-Crystal-Structure-of-Magnesium.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
12  
99+
24  
99+
Number of Neutrons
12  
99+
28  
99+
Number of Electrons
12  
99+
24  
99+
Radius of an Atom
  
  
Atomic Radius
160.00 pm  
29
128.00 pm  
99+
Covalent Radius
141.00 pm  
99+
139.00 pm  
99+
Van der Waals Radius
173.00 pm  
99+
200.00 pm  
35
Atomic Weight
24.31 amu  
99+
52.00 amu  
99+
Atomic Volume
13.97 cm3/mol  
99+
7.23 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Sodium
  
Vanadium
  
Next Element
Aluminium
  
Manganese
  
Valence Electron Potential
40.00 (-eV)  
99+
170.00 (-eV)  
4
Lattice Constant
320.94 pm  
99+
291.00 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.62  
15
1.86  
4
Mechanical
Density
  
  
Density At Room Temperature
1.74 g/cm3  
99+
7.19 g/cm3  
99+
Density When Liquid (at m.p.)
1.58 g/cm3  
99+
6.30 g/cm3  
99+
Tensile Strength
150.00 MPa  
25
689.00 MPa  
7
Viscosity
0.00  
24
0.00  
23
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
26
Vapor Pressure at 2000 K
0.00 (Pa)  
30
774.00 (Pa)  
1
Elasticity properties
  
  
Shear Modulus
17.00 GPa  
99+
115.00 GPa  
9
Bulk Modulus
45.00 GPa  
29
160.00 GPa  
11
Young's Modulus
45.00 GPa  
99+
279.00 GPa  
8
Poisson Ratio
0.29  
15
0.21  
33
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
1.74  
99+
7.19  
99+
Magnetic Ordering
Paramagnetic  
Antiferromagnetic  
Permeability
0.00 H/m  
8
0.00 H/m  
17
Susceptibility
0.00  
33
0.00  
10
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
43.90 nΩ·m  
99+
125.00 nΩ·m  
27
Electrical Conductivity
0.23 106/cm Ω  
7
0.08 106/cm Ω  
30
Electron Affinity
0.00 kJ/mol  
99+
64.30 kJ/mol  
17
Thermal
Specific Heat
1.02 J/(kg K)  
4
0.45 J/(kg K)  
12
Molar Heat Capacity
24.87 J/mol·K  
99+
23.35 J/mol·K  
99+
Thermal Conductivity
156.00 W/m·K  
8
93.90 W/m·K  
17
Critical Temperature
923.00 K  
99+
1,907.00 K  
24
Thermal Expansion
24.80 µm/(m·K)  
15
4.90 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
128.70 kJ/mol  
99+
348.80 kJ/mol  
35
Enthalpy of Fusion
8.95 kJ/mol  
99+
15.31 kJ/mol  
20
Enthalpy of Atomization
148.50 kJ/mol  
99+
397.50 kJ/mol  
27
Standard Molar Entropy
32.70 J/mol.K  
99+
23.80 J/mol.K  
99+
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