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Bohrium vs Hafnium

Bohrium
Hafnium
Hafnium vs Bohrium


Periodic Table
Symbol
Bh  
Hf  
Group Number
7  
11
4  
14
Period Number
7  
6  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
54037148  
12
7440586  
30
Space Group Name
-  
P63/mmc  
Space Group Number
276.00  
1
194.00  
7
Facts
Interesting Facts
  • Bohrium metal is also known as Unnilseptium (Uns) and Nielsbohrium (Ns).
  
  • Hafnium metal is highly reactive, hence not found free in nature.
  • Hafnium metal as predicated after Mendeleev finished his periodic table.
  
Sources
Found in Minerals, Mining, Synthetically Produced  
By-product Zirconium Refining  
History
  
  
Who Discovered
Gesellschaft für Schwerionenforschung  
Dirk Coster and George de Hevesy  
Discovery
In 1981  
In 1922  
Abundance
  
  
Abundance In Universe
0.00 %  
37
0.00 %  
26
Abundance In Sun
-  
0.00 %  
26
Abundance In Meteorites
0.00 %  
99+
0.00 %  
37
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
31
Abundance In Oceans
-  
0.00 %  
27
Abundance In Humans
-  
0.00 %  
14
Uses
Uses & Benefits
  • Currently known uses of Bohrium metal are limited to research purpose only.
  
  • 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.
  
Industrial Uses
-  
Ammunition Industry  
Medical Uses
-  
-  
Other Uses
Research Purposes  
Alloys, In Nuclear Reactors, Nuclear Research, 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
0.00 °C  
99+
5,400.00 °C  
5
Appearance
  
  
Physical State
Solid  
Solid  
Color
-  
Gray  
Luster
Unknown Luster  
Metallic  
Hardness
  
  
Mohs Hardness
7.00  
3
5.50  
7
Brinell Hardness
270.00 MPa  
99+
1,450.00 MPa  
6
Vickers Hardness
2,700.00 MPa  
4
1,520.00 MPa  
10
Speed of Sound
2,680.00 m/s  
99+
3,010.00 m/s  
39
Optical Properties
  
  
Refractive Index
1.50  
36
2.00  
15
Reflectivity
59.00 %  
24
71.00 %  
12
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Bh  
Hf  
Isotopes
  
  
Known Isotopes
5  
32
32  
7
Electronegativity
  
  
Pauling Electronegativity
2.00  
8
1.30  
33
Sanderson Electronegativity
1.30  
25
1.30  
25
Allred Rochow Electronegativity
1.30  
25
1.23  
26
Mulliken-Jaffe Electronegativity
1.30  
33
1.30  
33
Allen Electronegativity
2.00  
6
1.16  
99+
Electropositivity
  
  
Pauling Electropositivity
2.00  
99+
2.70  
22
Ionization Energies
  
  
1st Energy Level
742.90 kJ/mol  
23
658.50 kJ/mol  
40
2nd Energy Level
1,688.50 kJ/mol  
31
1,440.00 kJ/mol  
99+
3rd Energy Level
2,566.50 kJ/mol  
99+
2,250.00 kJ/mol  
99+
4th Energy Level
3,598.90 kJ/mol  
99+
3,216.00 kJ/mol  
99+
5th Energy Level
4,727.80 kJ/mol  
99+
6,585.00 kJ/mol  
33
6th Energy Level
5,991.70 kJ/mol  
99+
6,585.00 kJ/mol  
99+
7th Energy level
7,226.80 kJ/mol  
34
6,580.00 kJ/mol  
99+
8th Energy Level
7,100.00 kJ/mol  
33
6,580.00 kJ/mol  
99+
9th Energy Level
5,800.00 kJ/mol  
99+
6,585.00 kJ/mol  
38
10th Energy Level
7,100.00 kJ/mol  
35
6,590.00 kJ/mol  
40
11th Energy Level
8,200.00 kJ/mol  
25
6,585.00 kJ/mol  
40
12th Energy Level
82,700.00 kJ/mol  
4
6,580.00 kJ/mol  
99+
13th Energy Level
7,100.00 kJ/mol  
29
6,580.00 kJ/mol  
35
14th Energy Level
8,200.00 kJ/mol  
17
658.50 kJ/mol  
99+
15th Energy Level
82,000.00 kJ/mol  
14
65,800.00 kJ/mol  
34
16th Energy Level
71,100.00 kJ/mol  
20
658.50 kJ/mol  
99+
17th Energy Level
820.00 kJ/mol  
31
658.50 kJ/mol  
99+
18th Energy Level
8,200.00 kJ/mol  
20
6,585.00 kJ/mol  
36
19th Energy Level
820.80 kJ/mol  
28
658.50 kJ/mol  
99+
20th Energy Level
820.00 kJ/mol  
21
658.00 kJ/mol  
37
21st Energy Level
8,200.00 kJ/mol  
11
658.50 kJ/mol  
99+
22nd Energy Level
820.00 kJ/mol  
16
658.00 kJ/mol  
31
23rd Energy Level
8,200.00 kJ/mol  
8
658.50 kJ/mol  
99+
24th Energy Level
820.00 kJ/mol  
12
658.50 kJ/mol  
31
25th Energy Level
820.00 kJ/mol  
10
658.00 kJ/mol  
33
26th Energy Level
820.00 kJ/mol  
10
658.50 kJ/mol  
32
27th Energy Level
820.00 kJ/mol  
9
658.50 kJ/mol  
33
28th Energy Level
820.00 kJ/mol  
15
658.50 kJ/mol  
38
29th Energy Level
820.00 kJ/mol  
14
658.50 kJ/mol  
39
30th Energy Level
820.00 kJ/mol  
10
658.00 kJ/mol  
35
Electrochemical Equivalent
3.00 g/amp-hr  
21
1.66 g/amp-hr  
99+
Electron Work Function
4.90 eV  
12
3.90 eV  
36
Other Chemical Properties
Ionization, Radioactive Isotopes  
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
107  
11
72  
99+
Electron Configuration
[Rn] 5f14 6d5 7s2  
[Xe] 4f14 5d2 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
107  
11
72  
99+
Number of Neutrons
155  
9
106  
30
Number of Electrons
107  
11
72  
99+
Radius of an Atom
  
  
Atomic Radius
128.00 pm  
99+
159.00 pm  
30
Covalent Radius
141.00 pm  
99+
175.00 pm  
25
Van der Waals Radius
0.00 pm  
99+
200.00 pm  
35
Atomic Weight
270.00 amu  
8
178.49 amu  
39
Atomic Volume
23.70 cm3/mol  
14
13.60 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Seaborgium
  
Lutetium
  
Next Element
Hassium
  
Tantalum
  
Valence Electron Potential
27.20 (-eV)  
99+
81.00 (-eV)  
16
Lattice Constant
-  
319.64 pm  
99+
Lattice Angles
-  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
1.57  
99+
1.58  
34
Mechanical
Density
  
  
Density At Room Temperature
37.10 g/cm3  
3
13.31 g/cm3  
27
Density When Liquid (at m.p.)
37.10 g/cm3  
3
12.00 g/cm3  
31
Tensile Strength
152.00 MPa  
24
445.00 MPa  
9
Viscosity
0.00  
25
0.00  
28
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
37
0.00 (Pa)  
25
Elasticity properties
  
  
Shear Modulus
28.00 GPa  
32
30.00 GPa  
27
Bulk Modulus
37.00 GPa  
99+
110.00 GPa  
15
Young's Modulus
0.00 GPa  
99+
78.00 GPa  
27
Poisson Ratio
0.35  
9
0.37  
7
Other Mechanical Properties
-  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
37.00  
5
13.31  
30
Magnetic Ordering
-  
Paramagnetic  
Permeability
0.00 H/m  
11
0.00 H/m  
9
Susceptibility
0.00  
24
0.00  
13
Electrical Properties
  
  
Electrical Property
-  
Conductor  
Resistivity
6.50 nΩ·m  
99+
331.00 nΩ·m  
14
Electrical Conductivity
0.00 106/cm Ω  
99+
0.03 106/cm Ω  
99+
Electron Affinity
-  
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.10 J/(kg K)  
99+
0.14 J/(kg K)  
38
Molar Heat Capacity
37.10 J/mol·K  
2
25.73 J/mol·K  
99+
Thermal Conductivity
37.00 W/m·K  
36
23.00 W/m·K  
99+
Critical Temperature
1,323.00 K  
99+
2,500.00 K  
11
Thermal Expansion
14.30 µm/(m·K)  
28
5.90 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
270.50 kJ/mol  
99+
661.10 kJ/mol  
6
Enthalpy of Fusion
-  
25.10 kJ/mol  
8
Enthalpy of Atomization
-  
703.00 kJ/mol  
5
Standard Molar Entropy
57.00 J/mol.K  
30
43.60 J/mol.K  
99+
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