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Magnesium Potassium Comparison

Magnesium
Potassium
Potassium Magnesium comparison


Periodic Table
Symbol
Mg   
K   
Group Number
2   
16
1   
17
Period Number
3   
4   
Block
s block   
s block   
Element Family
Alkaline Earth   
Alkali   
CAS Number
7439954   
99+
7440097   
99+
Space Group Name
P63/mmc   
Im_ 3m   
Space Group Number
194.00   
5
229.00   
1
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.
  
  • In the list of most abundant element Potassium is ranked 7th.
  • Potassium can easily be sliced (chopped) down using knife.
  
Sources
By Electrolysis Process, In Ocean, Mining   
Found in Minerals, Mining   
History
  
  
Who Discovered
Joseph Black   
Humphry Davy   
Discovery
In 1755   
In 1807   
Abundance
  
  
Abundance In Universe
6 * 10-2 %   
2
3 * 10-4 %   
9
Abundance In Sun
~0.07 %   
2
~0.0004 %   
9
Abundance In Meteorites
12.00 %   
2
0.07 %   
9
Abundance In Earth's Crust
2.90 %   
4
1.50 %   
6
Abundance In Oceans
0.13 %   
2
0.04 %   
3
Abundance In Humans
0.03 %   
4
0.20 %   
2
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.
  
  • Potassium’s compounds are in high demand for their application in Fertilizer manufacturing.
  • Potassium carbonate is used in glass manufacturing and Potassium carbonate in manufacturing detergent and body wash.
  
Industrial Uses
Aerospace Industry, Ammunition Industry, Automobile Industry, Chemical Industry, Pharmaceutical Industry   
Ammunition Industry, Chemical Industry   
Medical Uses
NA   
Pharmaceutical Industry   
Other Uses
Surgical Instruments Manufacturing   
NA   
Biological Properties
  
  
Toxicity
Non Toxic   
Toxic   
Present in Human Body
Yes   
Yes   
In Blood
37.80 Blood/mg dm-3   
5
1,620.00 Blood/mg dm-3   
2
In Bone
1,800.00 p.p.m.   
4
2,100.00 p.p.m.   
3
Physical Properties
Melting Point
650.00 °C   
99+
63.65 °C   
99+
Boiling Point
1,107.00 °C   
99+
774.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Gray   
Silvery Gray   
Luster
NA   
NA   
Hardness
  
  
Mohs Hardness
2.50   
14
0.40   
23
Brinell Hardness
260.00 MPa   
36
0.36 MPa   
99+
Speed of Sound
4,940.00 m/s   
11
2,000.00 m/s   
99+
Optical Properties
  
  
Reflectivity
74.00 %   
7
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
Mg   
K   
Isotopes
  
  
Known Isotopes
15   
24
20   
19
Electronegativity
  
  
Pauling Electronegativity
1.31   
31
0.82   
99+
Sanderson Electronegativity
1.32   
18
0.45   
31
Allred Rochow Electronegativity
1.23   
25
0.91   
39
Mulliken-Jaffe Electronegativity
1.37   
16
0.73   
23
Allen Electronegativity
1.29   
35
0.73   
99+
Electropositivity
  
  
Pauling Electropositivity
2.69   
23
3.18   
3
Ionization Energies
  
  
1st Energy Level
737.70 kJ/mol   
24
418.80 kJ/mol   
99+
2nd Energy Level
1,450.70 kJ/mol   
99+
3,052.00 kJ/mol   
5
3rd Energy Level
7,732.70 kJ/mol   
5
4,420.00 kJ/mol   
8
4th Energy Level
10,542.50 kJ/mol   
4
5,877.00 kJ/mol   
9
5th Energy Level
13,630.00 kJ/mol   
3
7,975.00 kJ/mol   
8
6th Energy Level
18,020.00 kJ/mol   
3
9,590.00 kJ/mol   
13
7th Energy level
21,711.00 kJ/mol   
3
11,343.00 kJ/mol   
17
8th Energy Level
25,661.00 kJ/mol   
3
14,944.00 kJ/mol   
13
9th Energy Level
31,653.00 kJ/mol   
3
16,963.70 kJ/mol   
15
10th Energy Level
35,458.00 kJ/mol   
5
48,610.00 kJ/mol   
3
11th Energy Level
169,988.00 kJ/mol   
1
54,490.00 kJ/mol   
4
12th Energy Level
189,368.00 kJ/mol   
1
60,730.00 kJ/mol   
4
13th Energy Level
Not Available   
68,950.00 kJ/mol   
4
14th Energy Level
Not Available   
75,900.00 kJ/mol   
5
15th Energy Level
Not Available   
83,080.00 kJ/mol   
6
16th Energy Level
Not Available   
93,400.00 kJ/mol   
7
17th Energy Level
Not Available   
99,710.00 kJ/mol   
8
Electrochemical Equivalent
0.45 g/amp-hr   
99+
1.46 g/amp-hr   
99+
Electron Work Function
3.66 eV   
29
2.30 eV   
99+
Other Chemical Properties
Corrosion, Highly Inflammable, Ionization, Solubility   
Chemical Stability, Flammability, Ionization, Solubility   
Atomic Properties
Atomic Number
12   
99+
19   
99+
Electron Configuration
[Ne] 3s2   
[Ar] 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+
19   
99+
Number of Neutrons
12   
99+
20   
99+
Number of Electrons
12   
99+
19   
99+
Radius of an Atom
  
  
Atomic Radius
160.00 pm   
27
227.00 pm   
3
Covalent Radius
141.00 pm   
99+
203.00 pm   
9
Van der Waals Radius
173.00 pm   
37
275.00 pm   
5
Atomic Weight
24.31 amu   
99+
39.10 amu   
99+
Atomic Volume
13.97 cm3/mol   
37
45.46 cm3/mol   
3
Adjacent Atomic Numbers
  
  
Previous Element
Sodium
  
Aluminium
  
Next Element
Aluminium
  
Calcium
  
Valence Electron Potential
40.00 (-eV)   
99+
10.40 (-eV)   
99+
Lattice Constant
320.94 pm   
99+
532.80 pm   
12
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
1.74 g/cm3   
99+
0.86 g/cm3   
99+
Density When Liquid (at m.p.)
1.58 g/cm3   
99+
0.83 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Shear Modulus
17.00 GPa   
37
1.30 GPa   
99+
Bulk Modulus
45.00 GPa   
25
3.10 GPa   
99+
Young's Modulus
45.00 GPa   
39
3.53 GPa   
99+
Poisson Ratio
0.29   
15
Not Available   
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
1.74   
99+
0.86   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
43.90 nΩ·m   
99+
72.00 nΩ·m   
37
Electrical Conductivity
0.23 106/cm Ω   
7
0.14 106/cm Ω   
14
Electron Affinity
0.00 kJ/mol   
40
48.40 kJ/mol   
22
Thermal Properties
Specific Heat
1.02 J/(kg K)   
4
0.75 J/(kg K)   
6
Molar Heat Capacity
24.87 J/mol·K   
99+
29.60 J/mol·K   
6
Thermal Conductivity
156.00 W/m·K   
8
102.50 W/m·K   
15
Critical Temperature
Not Available   
2,223.00 K   
3
Thermal Expansion
24.80 µm/(m·K)   
15
83.30 µm/(m·K)   
3
Enthalpy
  
  
Enthalpy of Vaporization
128.70 kJ/mol   
99+
77.50 kJ/mol   
99+
Enthalpy of Fusion
8.95 kJ/mol   
39
2.32 kJ/mol   
99+
Enthalpy of Atomization
148.50 kJ/mol   
99+
89.50 kJ/mol   
99+
Standard Molar Entropy
32.70 J/mol.K   
99+
64.70 J/mol.K   
18
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