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Hafnium vs Rhenium

Hafnium
Rhenium
Rhenium vs Hafnium


Periodic Table
Symbol
Hf  
Re  
Group Number
4  
14
7  
11
Period Number
6  
6  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7440586  
30
7440155  
99+
Space Group Name
P63/mmc  
P63/mmc  
Space Group Number
194.00  
7
194.00  
7
Facts
Interesting Facts
  • Hafnium metal is highly reactive, hence not found free in nature.
  • Hafnium metal as predicated after Mendeleev finished his periodic table.
  
  • Chemical properties of Rhenium are similar to Manganese.
  • Rhenium metal is created while refining Molybdenum.
  
Sources
By-product Zirconium Refining  
Found in Minerals, Mining, Ores of Minerals  
History
  
  
Who Discovered
Dirk Coster and George de Hevesy  
Masataka Ogawa  
Discovery
In 1922  
In 1908  
Abundance
  
  
Abundance In Universe
0.00 %  
26
0.00 %  
30
Abundance In Sun
0.00 %  
26
0.00 %  
29
Abundance In Meteorites
0.00 %  
37
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
31
0.00 %  
99+
Abundance In Oceans
0.00 %  
27
0.00 %  
34
Abundance In Humans
0.00 %  
14
0.00 %  
24
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.
  
  • 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.
  
Industrial Uses
Ammunition Industry  
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry  
Medical Uses
-  
-  
Other Uses
Alloys, In Nuclear Reactors, Nuclear Research, Research Purposes  
Alloys  
Biological Properties
  
  
Toxicity
Toxic  
Low Toxic  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
37
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
2,150.00 °C  
10
3,180.00 °C  
2
Boiling Point
5,400.00 °C  
5
5,627.00 °C  
2
Appearance
  
  
Physical State
Solid  
Solid  
Color
Gray  
Silvery Gray  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
5.50  
7
7.00  
3
Brinell Hardness
1,450.00 MPa  
6
1,320.00 MPa  
8
Vickers Hardness
1,520.00 MPa  
10
1,350.00 MPa  
12
Speed of Sound
3,010.00 m/s  
39
4,700.00 m/s  
19
Optical Properties
  
  
Refractive Index
2.00  
15
1.90  
18
Reflectivity
71.00 %  
12
70.00 %  
13
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Hf  
Re  
Isotopes
  
  
Known Isotopes
32  
7
33  
6
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
1.90  
12
Sanderson Electronegativity
1.30  
25
1.90  
13
Allred Rochow Electronegativity
1.23  
26
1.46  
16
Mulliken-Jaffe Electronegativity
1.30  
33
1.90  
13
Allen Electronegativity
1.16  
99+
1.60  
24
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.10  
99+
Ionization Energies
  
  
1st Energy Level
658.50 kJ/mol  
40
760.00 kJ/mol  
20
2nd Energy Level
1,440.00 kJ/mol  
99+
1,260.00 kJ/mol  
99+
3rd Energy Level
2,250.00 kJ/mol  
99+
2,510.00 kJ/mol  
99+
4th Energy Level
3,216.00 kJ/mol  
99+
3,640.00 kJ/mol  
99+
5th Energy Level
6,585.00 kJ/mol  
33
7,600.00 kJ/mol  
20
6th Energy Level
6,585.00 kJ/mol  
99+
7,600.00 kJ/mol  
37
7th Energy level
6,580.00 kJ/mol  
99+
7,600.00 kJ/mol  
31
8th Energy Level
6,580.00 kJ/mol  
99+
5,560.00 kJ/mol  
99+
9th Energy Level
6,585.00 kJ/mol  
38
5,560.00 kJ/mol  
99+
10th Energy Level
6,590.00 kJ/mol  
40
7,600.00 kJ/mol  
31
11th Energy Level
6,585.00 kJ/mol  
40
7,600.00 kJ/mol  
30
12th Energy Level
6,580.00 kJ/mol  
99+
7,600.00 kJ/mol  
99+
13th Energy Level
6,580.00 kJ/mol  
35
7,600.00 kJ/mol  
23
14th Energy Level
658.50 kJ/mol  
99+
7,600.00 kJ/mol  
20
15th Energy Level
65,800.00 kJ/mol  
34
76,000.00 kJ/mol  
20
16th Energy Level
658.50 kJ/mol  
99+
76,000.00 kJ/mol  
15
17th Energy Level
658.50 kJ/mol  
99+
760.10 kJ/mol  
36
18th Energy Level
6,585.00 kJ/mol  
36
7,600.00 kJ/mol  
26
19th Energy Level
658.50 kJ/mol  
99+
760.40 kJ/mol  
33
20th Energy Level
658.00 kJ/mol  
37
760.00 kJ/mol  
27
21st Energy Level
658.50 kJ/mol  
99+
760.00 kJ/mol  
99+
22nd Energy Level
658.00 kJ/mol  
31
760.00 kJ/mol  
21
23rd Energy Level
658.50 kJ/mol  
99+
760.00 kJ/mol  
99+
24th Energy Level
658.50 kJ/mol  
31
760.00 kJ/mol  
18
25th Energy Level
658.00 kJ/mol  
33
760.00 kJ/mol  
18
26th Energy Level
658.50 kJ/mol  
32
760.00 kJ/mol  
18
27th Energy Level
658.50 kJ/mol  
33
760.00 kJ/mol  
17
28th Energy Level
658.50 kJ/mol  
38
760.00 kJ/mol  
23
29th Energy Level
658.50 kJ/mol  
39
760.00 kJ/mol  
24
30th Energy Level
658.00 kJ/mol  
35
760.00 kJ/mol  
18
Electrochemical Equivalent
1.66 g/amp-hr  
99+
0.99 g/amp-hr  
99+
Electron Work Function
3.90 eV  
36
4.96 eV  
11
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
72  
99+
75  
99+
Electron Configuration
[Xe] 4f14 5d2 6s2  
[Xe] 4f14 5d5 6s2  
Crystal Structure
Hexagonal Close Packed (HCP)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
72  
99+
75  
40
Number of Neutrons
106  
30
111  
27
Number of Electrons
72  
99+
75  
40
Radius of an Atom
  
  
Atomic Radius
159.00 pm  
30
137.00 pm  
99+
Covalent Radius
175.00 pm  
25
151.00 pm  
36
Van der Waals Radius
200.00 pm  
35
200.00 pm  
35
Atomic Weight
178.49 amu  
39
186.21 amu  
36
Atomic Volume
13.60 cm3/mol  
99+
8.85 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Lutetium
  
Tungsten
  
Next Element
Tantalum
  
Osmium
  
Valence Electron Potential
81.00 (-eV)  
16
180.00 (-eV)  
3
Lattice Constant
319.64 pm  
99+
276.10 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.58  
34
1.62  
17
Mechanical
Density
  
  
Density At Room Temperature
13.31 g/cm3  
27
21.02 g/cm3  
12
Density When Liquid (at m.p.)
12.00 g/cm3  
31
18.90 g/cm3  
14
Tensile Strength
445.00 MPa  
9
1,070.00 MPa  
3
Viscosity
0.00  
28
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
25
0.00 (Pa)  
40
Elasticity properties
  
  
Shear Modulus
30.00 GPa  
27
178.00 GPa  
3
Bulk Modulus
110.00 GPa  
15
370.00 GPa  
2
Young's Modulus
78.00 GPa  
27
463.00 GPa  
2
Poisson Ratio
0.37  
7
0.30  
14
Other Mechanical Properties
Ductile, Malleable  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.31  
30
21.02  
14
Magnetic Ordering
Paramagnetic  
Paramagnetic  
Permeability
0.00 H/m  
9
0.00 H/m  
8
Susceptibility
0.00  
13
0.00  
26
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
331.00 nΩ·m  
14
193.00 nΩ·m  
20
Electrical Conductivity
0.03 106/cm Ω  
99+
0.05 106/cm Ω  
38
Electron Affinity
0.00 kJ/mol  
99+
14.50 kJ/mol  
99+
Thermal
Specific Heat
0.14 J/(kg K)  
38
0.13 J/(kg K)  
40
Molar Heat Capacity
25.73 J/mol·K  
99+
25.48 J/mol·K  
99+
Thermal Conductivity
23.00 W/m·K  
99+
48.00 W/m·K  
31
Critical Temperature
2,500.00 K  
11
3,459.00 K  
2
Thermal Expansion
5.90 µm/(m·K)  
99+
6.20 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
661.10 kJ/mol  
6
707.10 kJ/mol  
4
Enthalpy of Fusion
25.10 kJ/mol  
8
33.05 kJ/mol  
2
Enthalpy of Atomization
703.00 kJ/mol  
5
791.00 kJ/mol  
2
Standard Molar Entropy
43.60 J/mol.K  
99+
36.90 J/mol.K  
99+
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