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Hafnium Bohrium Comparison

Hafnium
Bohrium
Bohrium Hafnium comparison


Periodic Table
Symbol
Hf   
Bh   
Group Number
4   
14
7   
11
Period Number
6   
7   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7440586   
30
54037148   
12
Space Group Name
P63/mmc   
Not Available   
Space Group Number
194.00   
5
Not Available   
Facts
Interesting Facts
  • Hafnium metal is highly reactive, hence not found free in nature.
  • Hafnium metal as predicated after Mendeleev finished his periodic table.
  
  • Bohrium metal is also known as Unnilseptium (Uns) and Nielsbohrium (Ns).
  
Sources
By-product Zirconium Refining   
Found in Minerals, Mining, Synthetically Produced   
History
  
  
Who Discovered
Dirk Coster and George de Hevesy   
Gesellschaft für Schwerionenforschung   
Discovery
In 1922   
In 1981   
Abundance
  
  
Abundance In Universe
7 * 10-8 %   
25
Not Available   
Abundance In Sun
~0.0000001 %   
26
~-9999 %   
Abundance In Meteorites
0.00 %   
37
Not Available   
Abundance In Earth's Crust
0.00 %   
31
Not Available   
Abundance In Oceans
0.00 %   
27
Not Available   
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 Bohrium metal are limited to research purpose only.
  
Industrial Uses
Ammunition Industry   
NA   
Medical Uses
NA   
NA   
Other Uses
Alloys, In Nuclear Reactors, Nuclear Research, Research Purposes   
Research Purposes   
Biological Properties
  
  
Toxicity
Toxic   
Unknown   
Present in Human Body
No   
No   
In Blood
Not Available   
0.00 Blood/mg dm-3   
37
In Bone
Not Available   
0.00 p.p.m.   
36
Physical Properties
Melting Point
2,150.00 °C   
10
Not Available   
Boiling Point
5,400.00 °C   
5
Not Available   
Appearance
  
  
Physical State
Solid   
Solid   
Color
Gray   
Unknown   
Luster
Metallic   
Unknown Luster   
Hardness
  
  
Mohs Hardness
5.50   
7
Not Available   
Brinell Hardness
1,450.00 MPa   
6
Not Available   
Vickers Hardness
1,520.00 MPa   
5
Not Available   
Speed of Sound
3,010.00 m/s   
27
Not Available   
Optical Properties
  
  
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   
Bh   
Isotopes
  
  
Known Isotopes
32   
7
5   
32
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
Not Available   
Allred Rochow Electronegativity
1.23   
25
Not Available   
Allen Electronegativity
1.16   
37
Not Available   
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
Not Available   
Ionization Energies
  
  
1st Energy Level
658.50 kJ/mol   
40
742.90 kJ/mol   
23
2nd Energy Level
1,440.00 kJ/mol   
99+
1,688.50 kJ/mol   
30
3rd Energy Level
2,250.00 kJ/mol   
99+
2,566.50 kJ/mol   
99+
4th Energy Level
3,216.00 kJ/mol   
99+
3,598.90 kJ/mol   
99+
5th Energy Level
Not Available   
4,727.80 kJ/mol   
37
6th Energy Level
Not Available   
5,991.70 kJ/mol   
24
7th Energy level
Not Available   
7,226.80 kJ/mol   
22
Electrochemical Equivalent
1.66 g/amp-hr   
99+
Not Available   
Electron Work Function
3.90 eV   
27
Not Available   
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Ionization, Radioactive Isotopes   
Atomic Properties
Atomic Number
72   
99+
107   
11
Electron Configuration
[Xe] 4f14 5d2 6s2   
[Rn] 5f14 6d5 7s2   
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+
107   
11
Number of Neutrons
106   
29
155   
8
Number of Electrons
72   
99+
107   
11
Radius of an Atom
  
  
Atomic Radius
159.00 pm   
28
128.00 pm   
99+
Covalent Radius
175.00 pm   
23
141.00 pm   
99+
Van der Waals Radius
200.00 pm   
28
Not Available   
Atomic Weight
178.49 amu   
39
270.00 amu   
8
Atomic Volume
13.60 cm3/mol   
38
Not Available   
Adjacent Atomic Numbers
  
  
Previous Element
Lutetium
  
Seaborgium
  
Next Element
Tantalum
  
Hassium
  
Valence Electron Potential
81.00 (-eV)   
16
Not Available   
Lattice Constant
319.64 pm   
99+
Not Available   
Lattice Angles
π/2, π/2, 2 π/3   
NA   
Lattice C/A Ratio
1.58   
12
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
13.31 g/cm3   
26
37.10 g/cm3   
3
Density When Liquid (at m.p.)
12.00 g/cm3   
12
Not Available   
Tensile Strength
445.00 MPa   
8
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 2000 K
0.00 (Pa)   
24
Not Available   
Elasticity properties
  
  
Shear Modulus
30.00 GPa   
23
Not Available   
Bulk Modulus
110.00 GPa   
15
Not Available   
Young's Modulus
78.00 GPa   
25
Not Available   
Poisson Ratio
0.37   
7
Not Available   
Other Mechanical Properties
Ductile, Malleable   
Unknown   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
13.31   
18
Not Available   
Magnetic Ordering
Paramagnetic   
Unknown   
Electrical Properties
  
  
Electrical Property
Conductor   
Unknown   
Resistivity
331.00 nΩ·m   
14
Not Available   
Electrical Conductivity
0.03 106/cm Ω   
39
Not Available   
Electron Affinity
0.00 kJ/mol   
40
Not Available   
Thermal Properties
Specific Heat
0.14 J/(kg K)   
37
Not Available   
Molar Heat Capacity
25.73 J/mol·K   
36
Not Available   
Thermal Conductivity
23.00 W/m·K   
99+
Not Available   
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
5.90 µm/(m·K)   
99+
Not Available   
Enthalpy
  
  
Enthalpy of Vaporization
661.10 kJ/mol   
5
Not Available   
Enthalpy of Fusion
25.10 kJ/mol   
8
Not Available   
Enthalpy of Atomization
703.00 kJ/mol   
5
Not Available   
Standard Molar Entropy
43.60 J/mol.K   
34
Not Available   
Summary >>
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