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Calcium vs Magnesium

Calcium
Magnesium
Magnesium vs Calcium


Periodic Table
Symbol
Ca   
Mg   
Group Number
2   
16
2   
16
Period Number
4   
3   
Block
s block   
s block   
Element Family
Alkaline Earth   
Alkaline Earth   
CAS Number
7440702   
21
7439954   
99+
Space Group Name
Fm_ 3m   
P63/mmc   
Space Group Number
225.00   
2
194.00   
5
Facts
Interesting Facts
  • Calcium ranks 5th rank in the list of earth’s abundance Percentage.
  • It is found in the compound state.
  • Gypsum or calcium sulfate is used as plaster and plaster of paris.
  
  • Magnesium ions are present in every chlorophyll of every green plant .
  • Controlling Magnesium fire by pouring water on it will result in explosions.
  
Sources
Earth's crust, Found in Minerals, Mining, Ores of Minerals   
By Electrolysis Process, In Ocean, Mining   
History
  
  
Who Discovered
Humphry Davy   
Joseph Black   
Discovery
In 1808   
In 1755   
Abundance
  
  
Abundance In Universe
7 * 10-3 %   
3
6 * 10-2 %   
2
Abundance In Sun
~0.007 %   
4
~0.07 %   
2
Abundance In Meteorites
1.10 %   
4
12.00 %   
2
Abundance In Earth's Crust
5.00 %   
3
2.90 %   
4
Abundance In Oceans
0.00 %   
5
0.13 %   
2
Abundance In Humans
1.40 %   
1
0.03 %   
4
Uses
Uses & Benefits
  • It is used as a reducing agent while preparing metals like thorium and uranium. It is also used as an alloying agent for metals such as aluminum, copper & lead.
  • Calcium carbonate or lime stone is used in cement.
  
  • 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.
  
Industrial Uses
Chemical Industry   
Aerospace Industry, Ammunition Industry, Automobile Industry, Chemical Industry, Pharmaceutical Industry   
Medical Uses
Dentistry, Pharmaceutical Industry   
NA   
Other Uses
Alloys   
Surgical Instruments Manufacturing   
Biological Properties
  
  
Toxicity
Non Toxic   
Non Toxic   
Present in Human Body
Yes   
Yes   
In Blood
60.50 Blood/mg dm-3   
4
37.80 Blood/mg dm-3   
5
In Bone
170,000.00 p.p.m.   
1
1,800.00 p.p.m.   
4
Physical Properties
Melting Point
839.00 °C   
99+
650.00 °C   
99+
Boiling Point
1,484.00 °C   
99+
1,107.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Gray   
Gray   
Luster
NA   
NA   
Hardness
  
  
Mohs Hardness
1.75   
17
2.50   
14
Brinell Hardness
170.00 MPa   
99+
260.00 MPa   
36
Speed of Sound
3,810.00 m/s   
19
4,940.00 m/s   
11
Optical Properties
  
  
Reflectivity
Not Available   
74.00 %   
7
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
Ca   
Mg   
Isotopes
  
  
Known Isotopes
19   
20
15   
24
Electronegativity
  
  
Pauling Electronegativity
1.00   
99+
1.31   
31
Sanderson Electronegativity
0.95   
24
1.32   
18
Allred Rochow Electronegativity
1.04   
34
1.23   
25
Mulliken-Jaffe Electronegativity
1.08   
17
1.37   
16
Allen Electronegativity
1.03   
39
1.29   
35
Electropositivity
  
  
Pauling Electropositivity
3.00   
9
2.69   
23
Ionization Energies
  
  
1st Energy Level
589.80 kJ/mol   
99+
737.70 kJ/mol   
24
2nd Energy Level
1,145.40 kJ/mol   
99+
1,450.70 kJ/mol   
99+
3rd Energy Level
4,912.40 kJ/mol   
7
7,732.70 kJ/mol   
5
4th Energy Level
6,491.00 kJ/mol   
7
10,542.50 kJ/mol   
4
5th Energy Level
8,153.00 kJ/mol   
7
13,630.00 kJ/mol   
3
6th Energy Level
10,496.00 kJ/mol   
8
18,020.00 kJ/mol   
3
7th Energy level
12,270.00 kJ/mol   
12
21,711.00 kJ/mol   
3
8th Energy Level
14,206.00 kJ/mol   
15
25,661.00 kJ/mol   
3
9th Energy Level
18,191.00 kJ/mol   
12
31,653.00 kJ/mol   
3
10th Energy Level
20,385.00 kJ/mol   
16
35,458.00 kJ/mol   
5
11th Energy Level
57,110.00 kJ/mol   
3
169,988.00 kJ/mol   
1
12th Energy Level
63,410.00 kJ/mol   
3
189,368.00 kJ/mol   
1
13th Energy Level
70,110.00 kJ/mol   
3
Not Available   
14th Energy Level
78,890.00 kJ/mol   
4
Not Available   
15th Energy Level
86,310.00 kJ/mol   
5
Not Available   
16th Energy Level
94,000.00 kJ/mol   
6
Not Available   
17th Energy Level
104,900.00 kJ/mol   
7
Not Available   
18th Energy Level
111,711.00 kJ/mol   
8
Not Available   
Electrochemical Equivalent
0.75 g/amp-hr   
99+
0.45 g/amp-hr   
99+
Electron Work Function
2.87 eV   
38
3.66 eV   
29
Other Chemical Properties
Chemical Stability, Flammability, Ionization, Solubility   
Corrosion, Highly Inflammable, Ionization, Solubility   
Atomic Properties
Atomic Number
20   
99+
12   
99+
Electron Configuration
[Ar] 4s2   
[Ne] 3s2   
Crystal Structure
Face Centered Cubic (FCC)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
FCC-Crystal-Structure-of-Calcium.jpg#100   
HCP-Crystal-Structure-of-Magnesium.jpg#100   
Atom
  
  
Number of Protons
20   
99+
12   
99+
Number of Neutrons
20   
99+
12   
99+
Number of Electrons
20   
99+
12   
99+
Radius of an Atom
  
  
Atomic Radius
197.00 pm   
6
160.00 pm   
27
Covalent Radius
176.00 pm   
22
141.00 pm   
99+
Van der Waals Radius
231.00 pm   
19
173.00 pm   
37
Atomic Weight
40.08 amu   
99+
24.31 amu   
99+
Atomic Volume
29.90 cm3/mol   
7
13.97 cm3/mol   
37
Adjacent Atomic Numbers
  
  
Previous Element
Potassium
  
Sodium
  
Next Element
Scandium
  
Aluminium
  
Valence Electron Potential
29.00 (-eV)   
99+
40.00 (-eV)   
99+
Lattice Constant
558.84 pm   
9
320.94 pm   
99+
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
1.55 g/cm3   
99+
1.74 g/cm3   
99+
Density When Liquid (at m.p.)
1.38 g/cm3   
99+
1.58 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
25.50 (Pa)   
3
Not Available   
Elasticity properties
  
  
Shear Modulus
7.40 GPa   
99+
17.00 GPa   
37
Bulk Modulus
17.00 GPa   
99+
45.00 GPa   
25
Young's Modulus
20.00 GPa   
99+
45.00 GPa   
39
Poisson Ratio
0.31   
13
0.29   
15
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
4.58   
99+
1.74   
99+
Magnetic Ordering
Diamagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
33.60 nΩ·m   
99+
43.90 nΩ·m   
99+
Electrical Conductivity
0.30 106/cm Ω   
6
0.23 106/cm Ω   
7
Electron Affinity
2.37 kJ/mol   
39
0.00 kJ/mol   
40
Thermal Properties
Specific Heat
0.63 J/(kg K)   
7
1.02 J/(kg K)   
4
Molar Heat Capacity
25.93 J/mol·K   
34
24.87 J/mol·K   
99+
Thermal Conductivity
201.00 W/m·K   
5
156.00 W/m·K   
8
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
22.30 µm/(m·K)   
19
24.80 µm/(m·K)   
15
Enthalpy
  
  
Enthalpy of Vaporization
150.00 kJ/mol   
99+
128.70 kJ/mol   
99+
Enthalpy of Fusion
8.54 kJ/mol   
99+
8.95 kJ/mol   
39
Enthalpy of Atomization
184.00 kJ/mol   
99+
148.50 kJ/mol   
99+
Standard Molar Entropy
41.60 J/mol.K   
36
32.70 J/mol.K   
99+
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