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Molybdenum vs Tungsten

Molybdenum
Tungsten
Tungsten vs Molybdenum


Periodic Table
Symbol
Mo  
W  
Group Number
6  
12
6  
12
Period Number
5  
6  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7439987  
99+
7440337  
99+
Space Group Name
Im_ 3m  
Im_ 3m  
Space Group Number
229.00  
2
229.00  
2
Facts
Interesting Facts
  • Molybdenum is highly reactive metal, hence not found free in nature .
  • Till 18th century Molybdenum element were often mistaken as a carbon or Lead.
  
  • Tungsten element has the second highest melting point.
  • Pure tungsten can easily cut down with the help of hacksaw.
  
Sources
Found in Minerals, Mining, Ores of Minerals  
Earth's crust, Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Carl Wilhelm Scheele  
-  
Discovery
In 1778  
In 1781  
Abundance
  
  
Abundance In Universe
0.00 %  
20
0.00 %  
28
Abundance In Sun
0.00 %  
19
0.00 %  
23
Abundance In Meteorites
0.00 %  
24
0.00 %  
39
Abundance In Earth's Crust
0.00 %  
39
0.00 %  
39
Abundance In Oceans
0.00 %  
9
0.00 %  
18
Abundance In Humans
0.00 %  
17
0.00 %  
24
Uses
Uses & Benefits
  • 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.
  
  • Tungsten and its alloys are used in high-temperature applications like welding electrodes, high-temperature furnace, etc.
  • Tungsten carbide is very hard and used in metal working, mining and petroleum industry.
  
Industrial Uses
Aerospace Industry, Electrical Industry, Electronic Industry  
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Toxic  
Non Toxic  
Present in Human Body
Yes  
Yes  
In Blood
0.00 Blood/mg dm-3  
31
0.00 Blood/mg dm-3  
31
In Bone
0.70 p.p.m.  
20
0.00 p.p.m.  
40
Physical
Melting Point
2,617.00 °C  
5
3,410.00 °C  
1
Boiling Point
4,612.00 °C  
9
5,660.00 °C  
1
Appearance
  
  
Physical State
Solid  
Solid  
Color
Gray  
Grayish White  
Luster
Metallic  
Lustrous  
Hardness
  
  
Mohs Hardness
5.50  
7
7.50  
2
Brinell Hardness
1,370.00 MPa  
7
2,000.00 MPa  
4
Vickers Hardness
1,400.00 MPa  
11
3,430.00 MPa  
3
Speed of Sound
5,400.00 m/s  
9
4,620.00 m/s  
20
Optical Properties
  
  
Refractive Index
2.00  
15
2.10  
11
Reflectivity
58.00 %  
25
62.00 %  
21
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Mo  
W  
Isotopes
  
  
Known Isotopes
25  
14
33  
6
Electronegativity
  
  
Pauling Electronegativity
2.16  
6
2.36  
3
Sanderson Electronegativity
1.15  
34
0.98  
99+
Allred Rochow Electronegativity
1.30  
25
1.40  
20
Mulliken-Jaffe Electronegativity
2.16  
7
2.36  
3
Allen Electronegativity
2.16  
3
1.47  
33
Electropositivity
  
  
Pauling Electropositivity
1.84  
99+
1.64  
99+
Ionization Energies
  
  
1st Energy Level
684.30 kJ/mol  
37
770.00 kJ/mol  
16
2nd Energy Level
1,560.00 kJ/mol  
38
1,700.00 kJ/mol  
30
3rd Energy Level
2,618.00 kJ/mol  
99+
2,045.40 kJ/mol  
99+
4th Energy Level
4,480.00 kJ/mol  
36
7,700.00 kJ/mol  
8
5th Energy Level
5,257.00 kJ/mol  
99+
7,700.00 kJ/mol  
17
6th Energy Level
6,640.80 kJ/mol  
99+
7,700.00 kJ/mol  
35
7th Energy level
12,125.00 kJ/mol  
13
7,700.00 kJ/mol  
29
8th Energy Level
13,860.00 kJ/mol  
16
7,700.00 kJ/mol  
29
9th Energy Level
15,835.00 kJ/mol  
16
7,700.00 kJ/mol  
25
10th Energy Level
17,980.00 kJ/mol  
18
7,700.00 kJ/mol  
29
11th Energy Level
20,190.00 kJ/mol  
17
7,700.00 kJ/mol  
28
12th Energy Level
22,219.00 kJ/mol  
38
7,700.00 kJ/mol  
99+
13th Energy Level
26,930.00 kJ/mol  
13
7,700.00 kJ/mol  
21
14th Energy Level
29,196.00 kJ/mol  
13
770.00 kJ/mol  
99+
15th Energy Level
52,490.00 kJ/mol  
99+
77,000.00 kJ/mol  
18
16th Energy Level
55,000.00 kJ/mol  
99+
77,000.00 kJ/mol  
13
17th Energy Level
61,400.00 kJ/mol  
9
770.00 kJ/mol  
34
18th Energy Level
67,700.00 kJ/mol  
9
7,700.00 kJ/mol  
24
19th Energy Level
74,000.00 kJ/mol  
9
770.00 kJ/mol  
31
20th Energy Level
80,400.00 kJ/mol  
10
770.00 kJ/mol  
25
21st Energy Level
87,000.00 kJ/mol  
9
770.00 kJ/mol  
99+
22nd Energy Level
93,400.00 kJ/mol  
7
770.00 kJ/mol  
19
23rd Energy Level
98,420.00 kJ/mol  
6
770.00 kJ/mol  
99+
24th Energy Level
104,400.00 kJ/mol  
2
770.00 kJ/mol  
15
25th Energy Level
121,900.00 kJ/mol  
1
770.00 kJ/mol  
14
26th Energy Level
127,700.00 kJ/mol  
1
770.00 kJ/mol  
14
27th Energy Level
133,800.00 kJ/mol  
1
770.00 kJ/mol  
13
28th Energy Level
139,800.00 kJ/mol  
1
770.00 kJ/mol  
19
29th Energy Level
148,100.00 kJ/mol  
1
770.00 kJ/mol  
19
30th Energy Level
154,500.00 kJ/mol  
1
770.00 kJ/mol  
14
Electrochemical Equivalent
0.89 g/amp-hr  
99+
1.14 g/amp-hr  
99+
Electron Work Function
4.60 eV  
17
4.55 eV  
18
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
42  
99+
74  
99+
Electron Configuration
[Kr] 4d5 5s1  
[Xe] 4f14 5d4 6s2  
Crystal Structure
Body Centered Cubic (BCC)  
Body Centered Cubic (BCC)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
42  
99+
74  
99+
Number of Neutrons
54  
99+
110  
28
Number of Electrons
42  
99+
74  
99+
Radius of an Atom
  
  
Atomic Radius
139.00 pm  
99+
139.00 pm  
99+
Covalent Radius
154.00 pm  
34
162.00 pm  
31
Van der Waals Radius
200.00 pm  
35
200.00 pm  
35
Atomic Weight
95.95 amu  
99+
183.84 amu  
37
Atomic Volume
9.40 cm3/mol  
99+
9.53 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Niobium
  
Tantalum
  
Next Element
Technetium
  
Rhenium
  
Valence Electron Potential
88.60 (-eV)  
13
140.00 (-eV)  
5
Lattice Constant
314.70 pm  
99+
316.52 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.03  
99+
1.29  
99+
Mechanical
Density
  
  
Density At Room Temperature
10.28 g/cm3  
39
19.25 g/cm3  
16
Density When Liquid (at m.p.)
9.33 g/cm3  
99+
17.60 g/cm3  
15
Tensile Strength
324.00 MPa  
15
370.00 MPa  
11
Viscosity
0.00  
5
0.00  
1
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
27
0.00 (Pa)  
99+
Elasticity properties
  
  
Shear Modulus
126.00 GPa  
8
161.00 GPa  
5
Bulk Modulus
230.00 GPa  
6
310.00 GPa  
4
Young's Modulus
329.00 GPa  
6
411.00 GPa  
4
Poisson Ratio
0.31  
13
0.28  
17
Other Mechanical Properties
Ductile, Weldable  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
10.22  
40
19.22  
18
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
9
0.00 H/m  
17
Susceptibility
0.00  
29
0.00  
23
Electrical Properties
  
  
Electrical Property
Semiconductor  
Superconductor  
Resistivity
53.40 nΩ·m  
99+
52.80 nΩ·m  
99+
Electrical Conductivity
0.19 106/cm Ω  
11
0.19 106/cm Ω  
10
Electron Affinity
71.90 kJ/mol  
16
78.60 kJ/mol  
15
Thermal
Specific Heat
0.25 J/(kg K)  
21
0.13 J/(kg K)  
40
Molar Heat Capacity
24.06 J/mol·K  
99+
24.27 J/mol·K  
99+
Thermal Conductivity
138.00 W/m·K  
12
173.00 W/m·K  
7
Critical Temperature
2,896.00 K  
6
3,695.00 K  
1
Thermal Expansion
4.80 µm/(m·K)  
99+
4.50 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
594.10 kJ/mol  
9
799.10 kJ/mol  
1
Enthalpy of Fusion
27.61 kJ/mol  
5
35.23 kJ/mol  
1
Enthalpy of Atomization
653.00 kJ/mol  
7
837.00 kJ/mol  
1
Standard Molar Entropy
28.70 J/mol.K  
99+
32.60 J/mol.K  
99+
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