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Hafnium vs Dubnium

Hafnium
Dubnium
Dubnium vs Hafnium


Periodic Table
Symbol
Hf  
Db  
Group Number
4  
14
5  
13
Period Number
6  
7  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7440586  
30
53850354  
14
Space Group Name
P63/mmc  
-  
Space Group Number
194.00  
7
166.00  
9
Facts
Interesting Facts
  • Hafnium metal is highly reactive, hence not found free in nature.
  • Hafnium metal as predicated after Mendeleev finished his periodic table.
  
  • IUPAC allotted a temporary name to Dubnium metal as “ Unnilpentium”.
  • In the production of Dubnium, thermal gradient chromatography is used.
  
Sources
By-product Zirconium Refining  
Produced by Bombarding Am243 with Ne22, Synthetically Produced  
History
  
  
Who Discovered
Dirk Coster and George de Hevesy  
Joint Institute for Nuclear Research  
Discovery
In 1922  
In 1968  
Abundance
  
  
Abundance In Universe
0.00 %  
26
0.00 %  
40
Abundance In Sun
0.00 %  
26
-  
Abundance In Meteorites
0.00 %  
37
0.00 %  
99+
Abundance In Earth's Crust
0.00 %  
31
-  
Abundance In Oceans
0.00 %  
27
-  
Abundance In Humans
0.00 %  
14
-  
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.
  
  • Currently known uses of Dubnium metal are limited to research purpose only.
  
Industrial Uses
Ammunition Industry  
-  
Medical Uses
-  
-  
Other Uses
Alloys, In Nuclear Reactors, Nuclear Research, Research Purposes  
Research Purposes  
Biological Properties
  
  
Toxicity
Toxic  
-  
Present in Human Body
No  
No  
In Blood
0.00 Blood/mg dm-3  
40
0.00 Blood/mg dm-3  
40
In Bone
0.00 p.p.m.  
99+
0.00 p.p.m.  
99+
Physical
Melting Point
2,150.00 °C  
10
-  
Boiling Point
5,400.00 °C  
5
0.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Gray  
-  
Luster
Metallic  
Unknown Luster  
Hardness
  
  
Mohs Hardness
5.50  
7
6.00  
6
Brinell Hardness
1,450.00 MPa  
6
330.00 MPa  
38
Vickers Hardness
1,520.00 MPa  
10
400.00 MPa  
99+
Speed of Sound
3,010.00 m/s  
39
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
2.00  
15
1.20  
99+
Reflectivity
71.00 %  
12
55.00 %  
27
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Hf  
Db  
Isotopes
  
  
Known Isotopes
32  
7
10  
28
Electronegativity
  
  
Pauling Electronegativity
1.30  
33
2.20  
5
Sanderson Electronegativity
1.30  
25
1.30  
25
Allred Rochow Electronegativity
1.23  
26
1.30  
25
Mulliken-Jaffe Electronegativity
1.30  
33
1.10  
99+
Allen Electronegativity
1.16  
99+
1.30  
40
Electropositivity
  
  
Pauling Electropositivity
2.70  
22
2.00  
99+
Ionization Energies
  
  
1st Energy Level
658.50 kJ/mol  
40
664.80 kJ/mol  
38
2nd Energy Level
1,440.00 kJ/mol  
99+
1,546.70 kJ/mol  
39
3rd Energy Level
2,250.00 kJ/mol  
99+
2,378.40 kJ/mol  
99+
4th Energy Level
3,216.00 kJ/mol  
99+
3,298.80 kJ/mol  
99+
5th Energy Level
6,585.00 kJ/mol  
33
4,305.20 kJ/mol  
99+
6th Energy Level
6,585.00 kJ/mol  
99+
12,900.00 kJ/mol  
5
7th Energy level
6,580.00 kJ/mol  
99+
3,300.00 kJ/mol  
99+
8th Energy Level
6,580.00 kJ/mol  
99+
5,280.00 kJ/mol  
99+
9th Energy Level
6,585.00 kJ/mol  
38
5,780.00 kJ/mol  
99+
10th Energy Level
6,590.00 kJ/mol  
40
8,830.00 kJ/mol  
22
11th Energy Level
6,585.00 kJ/mol  
40
3,300.00 kJ/mol  
99+
12th Energy Level
6,580.00 kJ/mol  
99+
88,300.00 kJ/mol  
2
13th Energy Level
6,580.00 kJ/mol  
35
4,760.00 kJ/mol  
99+
14th Energy Level
658.50 kJ/mol  
99+
1,120.00 kJ/mol  
99+
15th Energy Level
65,800.00 kJ/mol  
34
33,000.00 kJ/mol  
99+
16th Energy Level
658.50 kJ/mol  
99+
33,000.00 kJ/mol  
99+
17th Energy Level
658.50 kJ/mol  
99+
1,129.00 kJ/mol  
19
18th Energy Level
6,585.00 kJ/mol  
36
0.00 kJ/mol  
99+
19th Energy Level
658.50 kJ/mol  
99+
1,094.90 kJ/mol  
18
20th Energy Level
658.00 kJ/mol  
37
0.00 kJ/mol  
99+
21st Energy Level
658.50 kJ/mol  
99+
883.00 kJ/mol  
36
22nd Energy Level
658.00 kJ/mol  
31
330.00 kJ/mol  
99+
23rd Energy Level
658.50 kJ/mol  
99+
1,150.00 kJ/mol  
33
24th Energy Level
658.50 kJ/mol  
31
528.30 kJ/mol  
99+
25th Energy Level
658.00 kJ/mol  
33
0.00 kJ/mol  
99+
26th Energy Level
658.50 kJ/mol  
32
579.80 kJ/mol  
99+
27th Energy Level
658.50 kJ/mol  
33
0.00 kJ/mol  
99+
28th Energy Level
658.50 kJ/mol  
38
1,150.00 kJ/mol  
3
29th Energy Level
658.50 kJ/mol  
39
1,094.00 kJ/mol  
5
30th Energy Level
658.00 kJ/mol  
35
0.00 kJ/mol  
99+
Electrochemical Equivalent
1.66 g/amp-hr  
99+
3.00 g/amp-hr  
21
Electron Work Function
3.90 eV  
36
4.90 eV  
12
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Ionization, Radioactive Isotopes, Radioactivity  
Atomic
Atomic Number
72  
99+
105  
13
Electron Configuration
[Xe] 4f14 5d2 6s2  
[Rn] 5f14 6d3 7s2  
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+
105  
13
Number of Neutrons
106  
30
157  
8
Number of Electrons
72  
99+
105  
13
Radius of an Atom
  
  
Atomic Radius
159.00 pm  
30
139.00 pm  
99+
Covalent Radius
175.00 pm  
25
149.00 pm  
37
Van der Waals Radius
200.00 pm  
35
0.00 pm  
99+
Atomic Weight
178.49 amu  
39
268.00 amu  
10
Atomic Volume
13.60 cm3/mol  
99+
22.80 cm3/mol  
17
Adjacent Atomic Numbers
  
  
Previous Element
Lutetium
  
Rutherfordium
  
Next Element
Tantalum
  
Seaborgium
  
Valence Electron Potential
81.00 (-eV)  
16
0.00 (-eV)  
99+
Lattice Constant
319.64 pm  
99+
-  
Lattice Angles
π/2, π/2, 2 π/3  
-  
Lattice C/A Ratio
1.58  
34
1.63  
14
Mechanical
Density
  
  
Density At Room Temperature
13.31 g/cm3  
27
29.30 g/cm3  
5
Density When Liquid (at m.p.)
12.00 g/cm3  
31
29.30 g/cm3  
6
Tensile Strength
445.00 MPa  
9
0.10 MPa  
99+
Viscosity
0.00  
28
0.00  
25
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
22
Vapor Pressure at 2000 K
0.00 (Pa)  
25
0.00 (Pa)  
30
Elasticity properties
  
  
Shear Modulus
30.00 GPa  
27
34.00 GPa  
22
Bulk Modulus
110.00 GPa  
15
39.00 GPa  
39
Young's Modulus
78.00 GPa  
27
0.00 GPa  
99+
Poisson Ratio
0.37  
7
0.39  
5
Other Mechanical Properties
Ductile, Malleable  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.31  
30
39.00  
3
Magnetic Ordering
Paramagnetic  
-  
Permeability
0.00 H/m  
9
0.00 H/m  
17
Susceptibility
0.00  
13
0.00  
24
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
331.00 nΩ·m  
14
6.80 nΩ·m  
99+
Electrical Conductivity
0.03 106/cm Ω  
99+
0.00 106/cm Ω  
99+
Electron Affinity
0.00 kJ/mol  
99+
-  
Thermal
Specific Heat
0.14 J/(kg K)  
38
0.10 J/(kg K)  
99+
Molar Heat Capacity
25.73 J/mol·K  
99+
29.30 J/mol·K  
11
Thermal Conductivity
23.00 W/m·K  
99+
0.00 W/m·K  
99+
Critical Temperature
2,500.00 K  
11
1,323.00 K  
99+
Thermal Expansion
5.90 µm/(m·K)  
99+
13.20 µm/(m·K)  
37
Enthalpy
  
  
Enthalpy of Vaporization
661.10 kJ/mol  
6
289.70 kJ/mol  
99+
Enthalpy of Fusion
25.10 kJ/mol  
8
-  
Enthalpy of Atomization
703.00 kJ/mol  
5
-  
Standard Molar Entropy
43.60 J/mol.K  
99+
55.00 J/mol.K  
34
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