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Rhenium vs Molybdenum

Rhenium
Molybdenum
Molybdenum vs Rhenium


Periodic Table
Symbol
Re  
Mo  
Group Number
7  
11
6  
12
Period Number
6  
5  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7440155  
99+
7439987  
99+
Space Group Name
P63/mmc  
Im_ 3m  
Space Group Number
194.00  
7
229.00  
2
Facts
Interesting Facts
  • Chemical properties of Rhenium are similar to Manganese.
  • Rhenium metal is created while refining Molybdenum.
  
  • Molybdenum is highly reactive metal, hence not found free in nature .
  • Till 18th century Molybdenum element were often mistaken as a carbon or Lead.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Masataka Ogawa  
Carl Wilhelm Scheele  
Discovery
In 1908  
In 1778  
Abundance
  
  
Abundance In Universe
0.00 %  
30
0.00 %  
20
Abundance In Sun
0.00 %  
29
0.00 %  
19
Abundance In Meteorites
0.00 %  
99+
0.00 %  
24
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
39
Abundance In Oceans
0.00 %  
34
0.00 %  
9
Abundance In Humans
0.00 %  
24
0.00 %  
17
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.
  
  • Its alloys are used to make engine parts, drills, saw blade, etc.
  • Lubricant additive made up of Molybdenum disulfide is commonly used in the industry. It is also used as a catalyst.
  
Industrial Uses
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry  
Aerospace 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  
31
In Bone
0.00 p.p.m.  
99+
0.70 p.p.m.  
20
Physical
Melting Point
3,180.00 °C  
2
2,617.00 °C  
5
Boiling Point
5,627.00 °C  
2
4,612.00 °C  
9
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery Gray  
Gray  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
7.00  
3
5.50  
7
Brinell Hardness
1,320.00 MPa  
8
1,370.00 MPa  
7
Vickers Hardness
1,350.00 MPa  
12
1,400.00 MPa  
11
Speed of Sound
4,700.00 m/s  
19
5,400.00 m/s  
9
Optical Properties
  
  
Refractive Index
1.90  
18
2.00  
15
Reflectivity
70.00 %  
13
58.00 %  
25
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Re  
Mo  
Isotopes
  
  
Known Isotopes
33  
6
25  
14
Electronegativity
  
  
Pauling Electronegativity
1.90  
12
2.16  
6
Sanderson Electronegativity
1.90  
13
1.15  
34
Allred Rochow Electronegativity
1.46  
16
1.30  
25
Mulliken-Jaffe Electronegativity
1.90  
13
2.16  
7
Allen Electronegativity
1.60  
24
2.16  
3
Electropositivity
  
  
Pauling Electropositivity
2.10  
99+
1.84  
99+
Ionization Energies
  
  
1st Energy Level
760.00 kJ/mol  
20
684.30 kJ/mol  
37
2nd Energy Level
1,260.00 kJ/mol  
99+
1,560.00 kJ/mol  
38
3rd Energy Level
2,510.00 kJ/mol  
99+
2,618.00 kJ/mol  
99+
4th Energy Level
3,640.00 kJ/mol  
99+
4,480.00 kJ/mol  
36
5th Energy Level
7,600.00 kJ/mol  
20
5,257.00 kJ/mol  
99+
6th Energy Level
7,600.00 kJ/mol  
37
6,640.80 kJ/mol  
99+
7th Energy level
7,600.00 kJ/mol  
31
12,125.00 kJ/mol  
13
8th Energy Level
5,560.00 kJ/mol  
99+
13,860.00 kJ/mol  
16
9th Energy Level
5,560.00 kJ/mol  
99+
15,835.00 kJ/mol  
16
10th Energy Level
7,600.00 kJ/mol  
31
17,980.00 kJ/mol  
18
11th Energy Level
7,600.00 kJ/mol  
30
20,190.00 kJ/mol  
17
12th Energy Level
7,600.00 kJ/mol  
99+
22,219.00 kJ/mol  
38
13th Energy Level
7,600.00 kJ/mol  
23
26,930.00 kJ/mol  
13
14th Energy Level
7,600.00 kJ/mol  
20
29,196.00 kJ/mol  
13
15th Energy Level
76,000.00 kJ/mol  
20
52,490.00 kJ/mol  
99+
16th Energy Level
76,000.00 kJ/mol  
15
55,000.00 kJ/mol  
99+
17th Energy Level
760.10 kJ/mol  
36
61,400.00 kJ/mol  
9
18th Energy Level
7,600.00 kJ/mol  
26
67,700.00 kJ/mol  
9
19th Energy Level
760.40 kJ/mol  
33
74,000.00 kJ/mol  
9
20th Energy Level
760.00 kJ/mol  
27
80,400.00 kJ/mol  
10
21st Energy Level
760.00 kJ/mol  
99+
87,000.00 kJ/mol  
9
22nd Energy Level
760.00 kJ/mol  
21
93,400.00 kJ/mol  
7
23rd Energy Level
760.00 kJ/mol  
99+
98,420.00 kJ/mol  
6
24th Energy Level
760.00 kJ/mol  
18
104,400.00 kJ/mol  
2
25th Energy Level
760.00 kJ/mol  
18
121,900.00 kJ/mol  
1
26th Energy Level
760.00 kJ/mol  
18
127,700.00 kJ/mol  
1
27th Energy Level
760.00 kJ/mol  
17
133,800.00 kJ/mol  
1
28th Energy Level
760.00 kJ/mol  
23
139,800.00 kJ/mol  
1
29th Energy Level
760.00 kJ/mol  
24
148,100.00 kJ/mol  
1
30th Energy Level
760.00 kJ/mol  
18
154,500.00 kJ/mol  
1
Electrochemical Equivalent
0.99 g/amp-hr  
99+
0.89 g/amp-hr  
99+
Electron Work Function
4.96 eV  
11
4.60 eV  
17
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes, Solubility  
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
75  
99+
42  
99+
Electron Configuration
[Xe] 4f14 5d5 6s2  
[Kr] 4d5 5s1  
Crystal Structure
Hexagonal Close Packed (HCP)  
Body Centered Cubic (BCC)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
75  
40
42  
99+
Number of Neutrons
111  
27
54  
99+
Number of Electrons
75  
40
42  
99+
Radius of an Atom
  
  
Atomic Radius
137.00 pm  
99+
139.00 pm  
99+
Covalent Radius
151.00 pm  
36
154.00 pm  
34
Van der Waals Radius
200.00 pm  
35
200.00 pm  
35
Atomic Weight
186.21 amu  
36
95.95 amu  
99+
Atomic Volume
8.85 cm3/mol  
99+
9.40 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Tungsten
  
Niobium
  
Next Element
Osmium
  
Technetium
  
Valence Electron Potential
180.00 (-eV)  
3
88.60 (-eV)  
13
Lattice Constant
276.10 pm  
99+
314.70 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.62  
17
1.03  
99+
Mechanical
Density
  
  
Density At Room Temperature
21.02 g/cm3  
12
10.28 g/cm3  
39
Density When Liquid (at m.p.)
18.90 g/cm3  
14
9.33 g/cm3  
99+
Tensile Strength
1,070.00 MPa  
3
324.00 MPa  
15
Viscosity
0.00  
25
0.00  
5
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
40
0.00 (Pa)  
27
Elasticity properties
  
  
Shear Modulus
178.00 GPa  
3
126.00 GPa  
8
Bulk Modulus
370.00 GPa  
2
230.00 GPa  
6
Young's Modulus
463.00 GPa  
2
329.00 GPa  
6
Poisson Ratio
0.30  
14
0.31  
13
Other Mechanical Properties
Ductile, Malleable  
Ductile, Weldable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
21.02  
14
10.22  
40
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
8
0.00 H/m  
9
Susceptibility
0.00  
26
0.00  
29
Electrical Properties
  
  
Electrical Property
Conductor  
Semiconductor  
Resistivity
193.00 nΩ·m  
20
53.40 nΩ·m  
99+
Electrical Conductivity
0.05 106/cm Ω  
38
0.19 106/cm Ω  
11
Electron Affinity
14.50 kJ/mol  
99+
71.90 kJ/mol  
16
Thermal
Specific Heat
0.13 J/(kg K)  
40
0.25 J/(kg K)  
21
Molar Heat Capacity
25.48 J/mol·K  
99+
24.06 J/mol·K  
99+
Thermal Conductivity
48.00 W/m·K  
31
138.00 W/m·K  
12
Critical Temperature
3,459.00 K  
2
2,896.00 K  
6
Thermal Expansion
6.20 µm/(m·K)  
99+
4.80 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
707.10 kJ/mol  
4
594.10 kJ/mol  
9
Enthalpy of Fusion
33.05 kJ/mol  
2
27.61 kJ/mol  
5
Enthalpy of Atomization
791.00 kJ/mol  
2
653.00 kJ/mol  
7
Standard Molar Entropy
36.90 J/mol.K  
99+
28.70 J/mol.K  
99+
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