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Rhenium vs Iridium

Rhenium
Iridium
Iridium vs Rhenium


Periodic Table
Symbol
Re  
Ir  
Group Number
7  
11
9  
9
Period Number
6  
6  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7440155  
99+
7439885  
99+
Space Group Name
P63/mmc  
Fm_ 3m  
Space Group Number
194.00  
7
225.00  
3
Facts
Interesting Facts
  • Chemical properties of Rhenium are similar to Manganese.
  • Rhenium metal is created while refining Molybdenum.
  
  • Iridium element occurs as natural alloys of Platinum and Osmium.
  • Iridium element is known as the most corrosion resistance metal .
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Masataka Ogawa  
Smithson Tennant  
Discovery
In 1908  
In 1803  
Abundance
  
  
Abundance In Universe
0.00 %  
30
0.00 %  
23
Abundance In Sun
0.00 %  
29
0.00 %  
25
Abundance In Meteorites
0.00 %  
99+
0.00 %  
29
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
0.00 %  
34
-  
Abundance In Humans
0.00 %  
24
0.00 %  
24
Uses
Uses & Benefits
  • Alloys of Rhenium are used as an electric contact material. It can resist withstand arc corrosion.
  • Its catalysts are used in hydrogenation of fine chemicals. Its Alloy with nickel is used to produce turbine blades.
  
  • 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, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry  
Automobile Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Low Toxic  
Toxic  
Present in Human Body
No  
Yes  
In Blood
0.00 Blood/mg dm-3  
37
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
3,180.00 °C  
2
2,410.00 °C  
7
Boiling Point
5,627.00 °C  
2
4,527.00 °C  
10
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery Gray  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
7.00  
3
6.50  
5
Brinell Hardness
1,320.00 MPa  
8
1,670.00 MPa  
5
Vickers Hardness
1,350.00 MPa  
12
1,760.00 MPa  
8
Speed of Sound
4,700.00 m/s  
19
4,825.00 m/s  
17
Optical Properties
  
  
Refractive Index
1.90  
18
2.40  
7
Reflectivity
70.00 %  
13
78.00 %  
8
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Re  
Ir  
Isotopes
  
  
Known Isotopes
33  
6
34  
5
Electronegativity
  
  
Pauling Electronegativity
1.90  
12
2.20  
5
Sanderson Electronegativity
1.90  
13
2.20  
8
Allred Rochow Electronegativity
1.46  
16
1.55  
12
Mulliken-Jaffe Electronegativity
1.90  
13
2.20  
6
Allen Electronegativity
1.60  
24
1.68  
20
Electropositivity
  
  
Pauling Electropositivity
2.10  
99+
1.80  
99+
Ionization Energies
  
  
1st Energy Level
760.00 kJ/mol  
20
880.00 kJ/mol  
9
2nd Energy Level
1,260.00 kJ/mol  
99+
1,600.00 kJ/mol  
36
3rd Energy Level
2,510.00 kJ/mol  
99+
2,256.10 kJ/mol  
99+
4th Energy Level
3,640.00 kJ/mol  
99+
880.00 kJ/mol  
99+
5th Energy Level
7,600.00 kJ/mol  
20
8,800.00 kJ/mol  
8
6th Energy Level
7,600.00 kJ/mol  
37
8,800.00 kJ/mol  
25
7th Energy level
7,600.00 kJ/mol  
31
8,800.00 kJ/mol  
22
8th Energy Level
5,560.00 kJ/mol  
99+
8,800.00 kJ/mol  
22
9th Energy Level
5,560.00 kJ/mol  
99+
8,800.00 kJ/mol  
21
10th Energy Level
7,600.00 kJ/mol  
31
8,800.00 kJ/mol  
23
11th Energy Level
7,600.00 kJ/mol  
30
8,800.00 kJ/mol  
20
12th Energy Level
7,600.00 kJ/mol  
99+
8,800.00 kJ/mol  
40
13th Energy Level
7,600.00 kJ/mol  
23
8,800.00 kJ/mol  
15
14th Energy Level
7,600.00 kJ/mol  
20
8,800.00 kJ/mol  
14
15th Energy Level
76,000.00 kJ/mol  
20
88,000.00 kJ/mol  
8
16th Energy Level
76,000.00 kJ/mol  
15
88,000.00 kJ/mol  
9
17th Energy Level
760.10 kJ/mol  
36
880.00 kJ/mol  
26
18th Energy Level
7,600.00 kJ/mol  
26
8,800.00 kJ/mol  
15
19th Energy Level
760.40 kJ/mol  
33
880.00 kJ/mol  
24
20th Energy Level
760.00 kJ/mol  
27
880.00 kJ/mol  
14
21st Energy Level
760.00 kJ/mol  
99+
880.00 kJ/mol  
37
22nd Energy Level
760.00 kJ/mol  
21
880.00 kJ/mol  
12
23rd Energy Level
760.00 kJ/mol  
99+
8,800.00 kJ/mol  
7
24th Energy Level
760.00 kJ/mol  
18
880.00 kJ/mol  
8
25th Energy Level
760.00 kJ/mol  
18
880.00 kJ/mol  
6
26th Energy Level
760.00 kJ/mol  
18
880.00 kJ/mol  
6
27th Energy Level
760.00 kJ/mol  
17
880.00 kJ/mol  
5
28th Energy Level
760.00 kJ/mol  
23
880.00 kJ/mol  
8
29th Energy Level
760.00 kJ/mol  
24
880.00 kJ/mol  
9
30th Energy Level
760.00 kJ/mol  
18
880.00 kJ/mol  
6
Electrochemical Equivalent
0.99 g/amp-hr  
99+
1.14 g/amp-hr  
99+
Electron Work Function
4.96 eV  
11
4.55 eV  
18
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Solubility  
Flammable, Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
75  
99+
77  
39
Electron Configuration
[Xe] 4f14 5d5 6s2  
[Xe] 4f14 5d7 6s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Face Centered Cubic (FCC)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
FCC-Crystal-Structure-of-Iridium.jpg#100  
Atom
  
  
Number of Protons
75  
40
74  
99+
Number of Neutrons
111  
27
110  
28
Number of Electrons
75  
40
74  
99+
Radius of an Atom
  
  
Atomic Radius
137.00 pm  
99+
136.00 pm  
99+
Covalent Radius
151.00 pm  
36
141.00 pm  
99+
Van der Waals Radius
200.00 pm  
35
202.00 pm  
34
Atomic Weight
186.21 amu  
36
192.22 amu  
34
Atomic Volume
8.85 cm3/mol  
99+
9.53 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Tungsten
  
Osmium
  
Next Element
Osmium
  
Platinum
  
Valence Electron Potential
180.00 (-eV)  
3
140.00 (-eV)  
5
Lattice Constant
276.10 pm  
99+
383.90 pm  
29
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.62  
17
1.58  
35
Mechanical
Density
  
  
Density At Room Temperature
21.02 g/cm3  
12
22.56 g/cm3  
10
Density When Liquid (at m.p.)
18.90 g/cm3  
14
19.00 g/cm3  
13
Tensile Strength
1,070.00 MPa  
3
2,000.00 MPa  
2
Viscosity
0.00  
25
0.00  
21
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
40
0.00 (Pa)  
26
Elasticity properties
  
  
Shear Modulus
178.00 GPa  
3
210.00 GPa  
2
Bulk Modulus
370.00 GPa  
2
320.00 GPa  
3
Young's Modulus
463.00 GPa  
2
528.00 GPa  
1
Poisson Ratio
0.30  
14
0.26  
22
Other Mechanical Properties
Ductile, Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
21.02  
14
21.78  
12
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
8
0.00 H/m  
16
Susceptibility
0.00  
26
0.00  
5
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
193.00 nΩ·m  
20
47.10 nΩ·m  
99+
Electrical Conductivity
0.05 106/cm Ω  
38
0.19 106/cm Ω  
10
Electron Affinity
14.50 kJ/mol  
99+
151.00 kJ/mol  
4
Thermal
Specific Heat
0.13 J/(kg K)  
40
0.13 J/(kg K)  
40
Molar Heat Capacity
25.48 J/mol·K  
99+
25.10 J/mol·K  
99+
Thermal Conductivity
48.00 W/m·K  
31
147.00 W/m·K  
10
Critical Temperature
3,459.00 K  
2
2,719.00 K  
8
Thermal Expansion
6.20 µm/(m·K)  
99+
6.40 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
707.10 kJ/mol  
4
799.10 kJ/mol  
1
Enthalpy of Fusion
33.05 kJ/mol  
2
35.23 kJ/mol  
1
Enthalpy of Atomization
791.00 kJ/mol  
2
837.00 kJ/mol  
1
Standard Molar Entropy
36.90 J/mol.K  
99+
35.50 J/mol.K  
99+
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