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Hafnium vs Tungsten

Hafnium
Tungsten
Tungsten vs Hafnium


Periodic Table
Symbol
Hf   
W   
Group Number
4   
14
6   
12
Period Number
6   
6   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7440586   
30
7440337   
99+
Space Group Name
P63/mmc   
Im_ 3m   
Space Group Number
194.00   
5
229.00   
1
Facts
Interesting Facts
  • Hafnium metal is highly reactive, hence not found free in nature.
  • Hafnium metal as predicated after Mendeleev finished his periodic table.
  
  • Tungsten element has the second highest melting point.
  • Pure tungsten can easily cut down with the help of hacksaw.
  
Sources
By-product Zirconium Refining   
Earth's crust, Found in Minerals, Mining, Ores of Minerals   
History
  
  
Who Discovered
Dirk Coster and George de Hevesy   
Not Available   
Discovery
In 1922   
In 1781   
Abundance
  
  
Abundance In Universe
7 * 10-8 %   
25
5 * 10-8 %   
27
Abundance In Sun
~0.0000001 %   
26
~0.0000004 %   
23
Abundance In Meteorites
0.00 %   
37
0.00 %   
39
Abundance In Earth's Crust
0.00 %   
31
0.00 %   
39
Abundance In Oceans
0.00 %   
27
0.00 %   
18
Uses
Uses & Benefits
  • It has an ability to absorb neutrons and hence it is used to make control rods in nuclear submarines. And this metal is also used in Plasma welding torches.
  • It alloys with iron, titanium and niobium are very useful.
  
  • 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
Ammunition Industry   
Aerospace Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys, In Nuclear Reactors, Nuclear Research, Research Purposes   
Alloys   
Biological Properties
  
  
Toxicity
Toxic   
Non Toxic   
Present in Human Body
No   
Yes   
In Blood
Not Available   
0.00 Blood/mg dm-3   
31
In Bone
Not Available   
0.00 p.p.m.   
35
Physical Properties
Melting Point
2,150.00 °C   
10
3,410.00 °C   
1
Boiling Point
5,400.00 °C   
5
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
1,450.00 MPa   
6
2,000.00 MPa   
4
Vickers Hardness
1,520.00 MPa   
5
3,430.00 MPa   
1
Speed of Sound
3,010.00 m/s   
27
4,620.00 m/s   
16
Optical Properties
  
  
Reflectivity
Not Available   
62.00 %   
13
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
Hf   
W   
Isotopes
  
  
Known Isotopes
32   
7
33   
6
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
2.36   
2
Sanderson Electronegativity
Not Available   
0.98   
23
Allred Rochow Electronegativity
1.23   
25
1.40   
19
Allen Electronegativity
1.16   
37
1.47   
29
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
1.64   
99+
Ionization Energies
  
  
1st Energy Level
658.50 kJ/mol   
40
770.00 kJ/mol   
16
2nd Energy Level
1,440.00 kJ/mol   
99+
1,700.00 kJ/mol   
29
3rd Energy Level
2,250.00 kJ/mol   
99+
Not Available   
4th Energy Level
3,216.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
1.66 g/amp-hr   
99+
1.14 g/amp-hr   
99+
Electron Work Function
3.90 eV   
27
4.55 eV   
13
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
72   
99+
74   
99+
Electron Configuration
[Xe] 4f14 5d2 6s2   
[Xe] 4f14 5d4 6s2   
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
72   
99+
74   
99+
Number of Neutrons
106   
29
110   
27
Number of Electrons
72   
99+
74   
99+
Radius of an Atom
  
  
Atomic Radius
159.00 pm   
28
139.00 pm   
39
Covalent Radius
175.00 pm   
23
162.00 pm   
29
Van der Waals Radius
200.00 pm   
28
200.00 pm   
28
Atomic Weight
178.49 amu   
39
183.84 amu   
37
Atomic Volume
13.60 cm3/mol   
38
9.53 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Lutetium
  
Tantalum
  
Next Element
Tantalum
  
Rhenium
  
Valence Electron Potential
81.00 (-eV)   
16
140.00 (-eV)   
5
Lattice Constant
319.64 pm   
99+
316.52 pm   
99+
Lattice Angles
π/2, π/2, 2 π/3   
π/2, π/2, π/2   
Lattice C/A Ratio
1.58   
12
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
13.31 g/cm3   
26
19.25 g/cm3   
16
Density When Liquid (at m.p.)
12.00 g/cm3   
12
17.60 g/cm3   
5
Tensile Strength
445.00 MPa   
8
370.00 MPa   
10
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.00 (Pa)   
24
0.00 (Pa)   
32
Elasticity properties
  
  
Shear Modulus
30.00 GPa   
23
161.00 GPa   
5
Bulk Modulus
110.00 GPa   
15
310.00 GPa   
4
Young's Modulus
78.00 GPa   
25
411.00 GPa   
4
Poisson Ratio
0.37   
7
0.28   
17
Other Mechanical Properties
Ductile, Malleable   
Ductile, Malleable   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
13.31   
18
19.22   
9
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Superconductor   
Resistivity
331.00 nΩ·m   
14
52.80 nΩ·m   
99+
Electrical Conductivity
0.03 106/cm Ω   
39
0.19 106/cm Ω   
10
Electron Affinity
0.00 kJ/mol   
40
78.60 kJ/mol   
13
Thermal Properties
Specific Heat
0.14 J/(kg K)   
37
0.13 J/(kg K)   
39
Molar Heat Capacity
25.73 J/mol·K   
36
24.27 J/mol·K   
99+
Thermal Conductivity
23.00 W/m·K   
99+
173.00 W/m·K   
7
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
5.90 µm/(m·K)   
99+
4.50 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
661.10 kJ/mol   
5
799.10 kJ/mol   
1
Enthalpy of Fusion
25.10 kJ/mol   
8
35.23 kJ/mol   
1
Enthalpy of Atomization
703.00 kJ/mol   
5
837.00 kJ/mol   
1
Standard Molar Entropy
43.60 J/mol.K   
34
32.60 J/mol.K   
99+
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