Rhenium vs Iridium
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
5
225.00
2
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
2 * 10-8 %
29
2 * 10-7 %
22
Abundance In Sun
~0.00000001 %
29
~0.0000002 %
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
Not Available
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
NA
NA
Other Uses
Alloys
Alloys
Biological Properties
Toxicity
Low Toxic
Toxic
Present in Human Body
No
Yes
Physical Properties
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
7
1,760.00 MPa
3
Speed of Sound
4,700.00 m/s
15
4,825.00 m/s
13
Optical Properties
Reflectivity
Not Available
78.00 %
6
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
Re
Ir
Isotopes
Known Isotopes
33
6
34
5
Electronegativity
Pauling Electronegativity
1.90
11
2.20
4
Allred Rochow Electronegativity
1.46
15
1.55
11
Allen Electronegativity
1.60
21
1.68
17
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
35
3rd Energy Level
2,510.00 kJ/mol
99+
Not Available
4th Energy Level
3,640.00 kJ/mol
99+
Not Available
Electrochemical Equivalent
0.99 g/amp-hr
99+
1.14 g/amp-hr
99+
Electron Work Function
4.96 eV
7
4.55 eV
13
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Solubility
Flammable, Ionization, Radioactive Isotopes, Radioactivity
Atomic Properties
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
26
110
27
Number of Electrons
75
40
74
99+
Radius of an Atom
Atomic Radius
137.00 pm
40
136.00 pm
99+
Covalent Radius
151.00 pm
34
141.00 pm
99+
Van der Waals Radius
200.00 pm
28
202.00 pm
27
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
Valence Electron Potential
180.00 (-eV)
3
140.00 (-eV)
5
Lattice Constant
276.10 pm
99+
383.90 pm
26
Lattice Angles
π/2, π/2, 2 π/3
π/2, π/2, π/2
Lattice C/A Ratio
1.62
3
Not Available
Mechanical Properties
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
4
19.00 g/cm3
3
Tensile Strength
1,070.00 MPa
3
2,000.00 MPa
2
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 2000 K
0.00 (Pa)
29
0.00 (Pa)
25
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
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
21.02
5
21.78
3
Magnetic Ordering
Paramagnetic
Paramagnetic
Electrical Properties
Electrical Property
Conductor
Conductor
Resistivity
193.00 nΩ·m
20
47.10 nΩ·m
99+
Electrical Conductivity
0.05 106/cm Ω
33
0.19 106/cm Ω
10
Electron Affinity
14.50 kJ/mol
35
151.00 kJ/mol
4
Thermal Properties
Specific Heat
0.13 J/(kg K)
39
0.13 J/(kg K)
39
Molar Heat Capacity
25.48 J/mol·K
38
25.10 J/mol·K
99+
Thermal Conductivity
48.00 W/m·K
31
147.00 W/m·K
10
Critical Temperature
Not Available
Not Available
Thermal Expansion
6.20 µm/(m·K)
99+
6.40 µm/(m·K)
99+
Enthalpy
Enthalpy of Vaporization
707.10 kJ/mol
3
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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