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Iridium vs Mercury

Iridium
Mercury
Mercury vs Iridium


Periodic Table
Symbol
Ir  
Hg  
Group Number
9  
9
12  
6
Period Number
6  
6  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7439885  
99+
7439976  
99+
Space Group Name
Fm_ 3m  
R_ 3m  
Space Group Number
225.00  
2
166.00  
6
Facts
Interesting Facts
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
  • At room temperature mercury is found in a liquid state.
  • A coin of pound or rupees floats in mercury.
  • Because of its low melting point and boiling point it is used in thermometers.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Mining, Ores of Minerals  
History
  
  
Who Discovered
Smithson Tennant  
Ancient Chinese and Indians  
Discovery
In 1803  
Before 2000 BCE  
Abundance
  
  
Abundance In Universe
2 * 10-7 %  
22
Not Available  
Abundance In Sun
~0.0000002 %  
25
~-9999 %  
Abundance In Meteorites
0.00 %  
29
Not Available  
Abundance In Earth's Crust
0.00 %  
99+
0.05 %  
9
Uses
Uses & Benefits
  • 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.
  
  • It is a liquid metal at room temperature, but it is a toxic heavy metal and hence many uses of mercury are under review or phased out.
  • It is manly used as a catalysts in chemical industry.
  
Industrial Uses
Automobile Industry, Electrical Industry, Electronic Industry  
Electrical Industry, Electronic Industry  
Medical Uses
NA  
Dentistry  
Other Uses
Alloys  
Alloys, Mirror Manufacturing, Pharmaceutical Industry  
Biological Properties
  
  
Toxicity
Toxic  
Highly Toxic  
Present in Human Body
Yes  
Yes  
In Blood
Not Available  
0.01 Blood/mg dm-3  
23
In Bone
Not Available  
0.45 p.p.m.  
19
Physical Properties
Melting Point
2,410.00 °C  
7
Not Available  
Boiling Point
4,527.00 °C  
10
356.58 °C  
99+
Appearance
  
  
Physical State
Solid  
Liquid  
Color
Silvery White  
Silver  
Luster
Metallic  
NA  
Hardness
  
  
Mohs Hardness
6.50  
5
Not Available  
Brinell Hardness
1,670.00 MPa  
5
Not Available  
Vickers Hardness
1,760.00 MPa  
3
Not Available  
Speed of Sound
4,825.00 m/s  
13
1,451.40 m/s  
99+
Optical Properties
  
  
Refractive Index
Not Available  
1.00  
3
Reflectivity
78.00 %  
6
73.00 %  
8
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
Ir  
Hg  
Isotopes
  
  
Known Isotopes
34  
5
34  
5
Electronegativity
  
  
Pauling Electronegativity
2.20  
4
2.00  
7
Sanderson Electronegativity
Not Available  
2.20  
7
Allred Rochow Electronegativity
1.55  
11
1.44  
17
Mulliken-Jaffe Electronegativity
Not Available  
1.81  
9
Allen Electronegativity
1.68  
17
1.44  
30
Electropositivity
  
  
Pauling Electropositivity
1.80  
99+
2.00  
99+
Ionization Energies
  
  
1st Energy Level
880.00 kJ/mol  
9
1,007.10 kJ/mol  
4
2nd Energy Level
1,600.00 kJ/mol  
35
1,810.00 kJ/mol  
20
3rd Energy Level
Not Available  
3,300.00 kJ/mol  
20
Electrochemical Equivalent
1.14 g/amp-hr  
99+
3.74 g/amp-hr  
10
Electron Work Function
4.55 eV  
13
4.49 eV  
15
Other Chemical Properties
Flammable, Ionization, Radioactive Isotopes, Radioactivity  
Flammability, Ionization, Solubility  
Atomic Properties
Atomic Number
77  
39
80  
36
Electron Configuration
[Xe] 4f14 5d7 6s2  
[Xe] 4f14 5d10 6s2  
Crystal Structure
Face Centered Cubic (FCC)  
Rhombohedral (RHO)  
Crystal Lattice
FCC-Crystal-Structure-of-Iridium.jpg#100  
RHO-Crystal-Structure-of-Mercury.jpg#100  
Atom
  
  
Number of Protons
74  
99+
80  
36
Number of Neutrons
110  
27
121  
22
Number of Electrons
74  
99+
80  
36
Radius of an Atom
  
  
Atomic Radius
136.00 pm  
99+
151.00 pm  
32
Covalent Radius
141.00 pm  
99+
132.00 pm  
99+
Van der Waals Radius
202.00 pm  
27
155.00 pm  
99+
Atomic Weight
192.22 amu  
34
200.59 amu  
32
Atomic Volume
9.53 cm3/mol  
99+
14.82 cm3/mol  
35
Adjacent Atomic Numbers
  
  
Previous Element
Osmium
  
Gold
  
Next Element
Platinum
  
Thallium
  
Valence Electron Potential
140.00 (-eV)  
5
28.20 (-eV)  
99+
Lattice Constant
383.90 pm  
26
300.50 pm  
99+
Lattice Angles
π/2, π/2, π/2  
NA  
Lattice C/A Ratio
Not Available  
Not Available  
Mechanical Properties
Density
  
  
Density At Room Temperature
22.56 g/cm3  
10
13.53 g/cm3  
24
Density When Liquid (at m.p.)
19.00 g/cm3  
3
Not Available  
Tensile Strength
2,000.00 MPa  
2
Not Available  
Viscosity
Not Available  
0.00  
1
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.00 (Pa)  
25
Not Available  
Elasticity properties
  
  
Shear Modulus
210.00 GPa  
2
Not Available  
Bulk Modulus
320.00 GPa  
3
Not Available  
Young's Modulus
528.00 GPa  
1
Not Available  
Poisson Ratio
0.26  
22
Not Available  
Other Mechanical Properties
NA  
NA  
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
21.78  
3
13.53  
16
Magnetic Ordering
Paramagnetic  
Diamagnetic  
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
47.10 nΩ·m  
99+
961.00 nΩ·m  
1
Electrical Conductivity
0.19 106/cm Ω  
10
0.01 106/cm Ω  
99+
Electron Affinity
151.00 kJ/mol  
4
0.00 kJ/mol  
40
Thermal Properties
Specific Heat
0.13 J/(kg K)  
39
0.14 J/(kg K)  
38
Molar Heat Capacity
25.10 J/mol·K  
99+
27.98 J/mol·K  
13
Thermal Conductivity
147.00 W/m·K  
10
8.30 W/m·K  
99+
Critical Temperature
Not Available  
1,750.00 K  
6
Thermal Expansion
6.40 µm/(m·K)  
99+
60.40 µm/(m·K)  
5
Enthalpy
  
  
Enthalpy of Vaporization
799.10 kJ/mol  
1
56.90 kJ/mol  
99+
Enthalpy of Fusion
35.23 kJ/mol  
1
2.29 kJ/mol  
99+
Enthalpy of Atomization
837.00 kJ/mol  
1
61.50 kJ/mol  
99+
Standard Molar Entropy
35.50 J/mol.K  
99+
75.80 J/mol.K  
6
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