Symbol
Mg
  
Ir
  
Period Number
3
  
6
  
Block
s block
  
d block
  
Element Family
Alkaline Earth
  
Transition Metal
  
Space Group Name
P63/mmc
  
Fm_ 3m
  
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.
  
- Iridium element occurs as natural alloys of Platinum and Osmium.
- Iridium element is known as the most corrosion resistance metal .
  
Sources
By Electrolysis Process, In Ocean, Mining
  
Found in Minerals, Mining, Ores of Minerals
  
History
  
  
Who Discovered
Joseph Black
  
Smithson Tennant
  
Discovery
In 1755
  
In 1803
  
Abundance
  
  
Abundance In Sun
~0.0000002 %
  
25
Abundance In Earth's Crust
Abundance In Oceans
Not Available
  
Abundance In Humans
Not Available
  
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.
  
- Iridium has an anti corrosion properties and it is used in special alloy with Osmium metal and that alloy is used in pen tips and compass bearings.
  
Industrial Uses
Aerospace Industry, Ammunition Industry, Automobile Industry, Chemical Industry, Pharmaceutical Industry
  
Automobile Industry, Electrical Industry, Electronic Industry
  
Medical Uses
NA
  
NA
  
Other Uses
Surgical Instruments Manufacturing
  
Alloys
  
Biological Properties
  
  
Toxicity
Non Toxic
  
Toxic
  
Present in Human Body
Yes
  
Yes
  
In Blood
37.80 Blood/mg dm-3
  
5
Not Available
  
In Bone
1,800.00 p.p.m.
  
4
Not Available
  
Boiling Point
1,107.00 °C
  
99+
4,527.00 °C
  
10
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Gray
  
Silvery White
  
Luster
NA
  
Metallic
  
Hardness
  
  
Brinell Hardness
1,670.00 MPa
  
5
Vickers Hardness
Not Available
  
1,760.00 MPa
  
3
Speed of Sound
4,940.00 m/s
  
11
4,825.00 m/s
  
13
Optical Properties
  
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Mg
  
Ir
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Not Available
  
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
737.70 kJ/mol
  
24
880.00 kJ/mol
  
9
2nd Energy Level
1,450.70 kJ/mol
  
99+
1,600.00 kJ/mol
  
35
3rd Energy Level
7,732.70 kJ/mol
  
5
Not Available
  
4th Energy Level
10,542.50 kJ/mol
  
4
Not Available
  
5th Energy Level
13,630.00 kJ/mol
  
3
Not Available
  
6th Energy Level
18,020.00 kJ/mol
  
3
Not Available
  
7th Energy level
21,711.00 kJ/mol
  
3
Not Available
  
8th Energy Level
25,661.00 kJ/mol
  
3
Not Available
  
9th Energy Level
31,653.00 kJ/mol
  
3
Not Available
  
10th Energy Level
35,458.00 kJ/mol
  
5
Not Available
  
11th Energy Level
169,988.00 kJ/mol
  
1
Not Available
  
12th Energy Level
189,368.00 kJ/mol
  
1
Not Available
  
Electrochemical Equivalent
0.45 g/amp-hr
  
99+
1.14 g/amp-hr
  
99+
Other Chemical Properties
Corrosion, Highly Inflammable, Ionization, Solubility
  
Flammable, Ionization, Radioactive Isotopes, Radioactivity
  
Electron Configuration
[Ne] 3s2
  
[Xe] 4f14 5d7 6s2
  
Crystal Structure
Hexagonal Close Packed (HCP)
  
Face Centered Cubic (FCC)
  
Crystal Lattice
HCP-Crystal-Structure-of-Magnesium.jpg#100
  
FCC-Crystal-Structure-of-Iridium.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Atomic Volume
13.97 cm3/mol
  
37
9.53 cm3/mol
  
99+
Adjacent Atomic Numbers
  
  
Valence Electron Potential
40.00 (-eV)
  
99+
140.00 (-eV)
  
5
Lattice Angles
π/2, π/2, 2 π/3
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Density
  
  
Density At Room Temperature
1.74 g/cm3
  
99+
22.56 g/cm3
  
10
Density When Liquid (at m.p.)
1.58 g/cm3
  
99+
Tensile Strength
Not Available
  
2,000.00 MPa
  
2
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 2000 K
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
NA
  
NA
  
Magnetic Characteristics
  
  
Magnetic Ordering
Paramagnetic
  
Paramagnetic
  
Electrical Properties
  
  
Electrical Property
Conductor
  
Conductor
  
Resistivity
43.90 nΩ·m
  
99+
47.10 nΩ·m
  
99+
Electrical Conductivity
0.23 106/cm Ω
  
7
0.19 106/cm Ω
  
10
Electron Affinity
0.00 kJ/mol
  
40
151.00 kJ/mol
  
4
Specific Heat
1.02 J/(kg K)
  
4
0.13 J/(kg K)
  
39
Molar Heat Capacity
24.87 J/mol·K
  
99+
25.10 J/mol·K
  
99+
Thermal Conductivity
156.00 W/m·K
  
8
147.00 W/m·K
  
10
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
24.80 µm/(m·K)
  
15
6.40 µm/(m·K)
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
128.70 kJ/mol
  
99+
799.10 kJ/mol
  
1
Enthalpy of Fusion
8.95 kJ/mol
  
39
35.23 kJ/mol
  
1
Enthalpy of Atomization
148.50 kJ/mol
  
99+
837.00 kJ/mol
  
1
Standard Molar Entropy
32.70 J/mol.K
  
99+
35.50 J/mol.K
  
99+