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Hafnium vs Mercury

Hafnium
Mercury
Mercury vs Hafnium


Periodic Table
Symbol
Hf   
Hg   
Group Number
4   
14
12   
6
Period Number
6   
6   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7440586   
30
7439976   
99+
Space Group Name
P63/mmc   
R_ 3m   
Space Group Number
194.00   
5
166.00   
6
Facts
Interesting Facts
  • Hafnium metal is highly reactive, hence not found free in nature.
  • Hafnium metal as predicated after Mendeleev finished his periodic table.
  
  • At room temperature mercury is found in a liquid state.
  • A coin of pound or rupees floats in mercury.
  • Because of its low melting point and boiling point it is used in thermometers.
  
Sources
By-product Zirconium Refining   
Mining, Ores of Minerals   
History
  
  
Who Discovered
Dirk Coster and George de Hevesy   
Ancient Chinese and Indians   
Discovery
In 1922   
Before 2000 BCE   
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
0.05 %   
9
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.
  
  • It is a liquid metal at room temperature, but it is a toxic heavy metal and hence many uses of mercury are under review or phased out.
  • It is manly used as a catalysts in chemical industry.
  
Industrial Uses
Ammunition Industry   
Electrical Industry, Electronic Industry   
Medical Uses
NA   
Dentistry   
Other Uses
Alloys, In Nuclear Reactors, Nuclear Research, Research Purposes   
Alloys, Mirror Manufacturing, Pharmaceutical Industry   
Biological Properties
  
  
Toxicity
Toxic   
Highly Toxic   
Present in Human Body
No   
Yes   
In Blood
Not Available   
0.01 Blood/mg dm-3   
23
In Bone
Not Available   
0.45 p.p.m.   
19
Physical Properties
Melting Point
2,150.00 °C   
10
Not Available   
Boiling Point
5,400.00 °C   
5
356.58 °C   
99+
Appearance
  
  
Physical State
Solid   
Liquid   
Color
Gray   
Silver   
Luster
Metallic   
NA   
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
1,451.40 m/s   
99+
Optical Properties
  
  
Refractive Index
Not Available   
1.00   
3
Reflectivity
Not Available   
73.00 %   
8
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   
Hg   
Isotopes
  
  
Known Isotopes
32   
7
34   
5
Electronegativity
  
  
Pauling Electronegativity
1.30   
32
2.00   
7
Sanderson Electronegativity
Not Available   
2.20   
7
Allred Rochow Electronegativity
1.23   
25
1.44   
17
Mulliken-Jaffe Electronegativity
Not Available   
1.81   
9
Allen Electronegativity
1.16   
37
1.44   
30
Electropositivity
  
  
Pauling Electropositivity
2.70   
22
2.00   
99+
Ionization Energies
  
  
1st Energy Level
658.50 kJ/mol   
40
1,007.10 kJ/mol   
4
2nd Energy Level
1,440.00 kJ/mol   
99+
1,810.00 kJ/mol   
20
3rd Energy Level
2,250.00 kJ/mol   
99+
3,300.00 kJ/mol   
20
4th Energy Level
3,216.00 kJ/mol   
99+
Not Available   
Electrochemical Equivalent
1.66 g/amp-hr   
99+
3.74 g/amp-hr   
10
Electron Work Function
3.90 eV   
27
4.49 eV   
15
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Flammability, Ionization, Solubility   
Atomic Properties
Atomic Number
72   
99+
80   
36
Electron Configuration
[Xe] 4f14 5d2 6s2   
[Xe] 4f14 5d10 6s2   
Crystal Structure
Hexagonal Close Packed (HCP)   
Rhombohedral (RHO)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
RHO-Crystal-Structure-of-Mercury.jpg#100   
Atom
  
  
Number of Protons
72   
99+
80   
36
Number of Neutrons
106   
29
121   
22
Number of Electrons
72   
99+
80   
36
Radius of an Atom
  
  
Atomic Radius
159.00 pm   
28
151.00 pm   
32
Covalent Radius
175.00 pm   
23
132.00 pm   
99+
Van der Waals Radius
200.00 pm   
28
155.00 pm   
99+
Atomic Weight
178.49 amu   
39
200.59 amu   
32
Atomic Volume
13.60 cm3/mol   
38
14.82 cm3/mol   
35
Adjacent Atomic Numbers
  
  
Previous Element
Lutetium
  
Gold
  
Next Element
Tantalum
  
Thallium
  
Valence Electron Potential
81.00 (-eV)   
16
28.20 (-eV)   
99+
Lattice Constant
319.64 pm   
99+
300.50 pm   
99+
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
13.53 g/cm3   
24
Density When Liquid (at m.p.)
12.00 g/cm3   
12
Not Available   
Tensile Strength
445.00 MPa   
8
Not Available   
Viscosity
Not Available   
0.00   
1
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   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
13.31   
18
13.53   
16
Magnetic Ordering
Paramagnetic   
Diamagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
331.00 nΩ·m   
14
961.00 nΩ·m   
1
Electrical Conductivity
0.03 106/cm Ω   
39
0.01 106/cm Ω   
99+
Electron Affinity
0.00 kJ/mol   
40
0.00 kJ/mol   
40
Thermal Properties
Specific Heat
0.14 J/(kg K)   
37
0.14 J/(kg K)   
38
Molar Heat Capacity
25.73 J/mol·K   
36
27.98 J/mol·K   
13
Thermal Conductivity
23.00 W/m·K   
99+
8.30 W/m·K   
99+
Critical Temperature
Not Available   
1,750.00 K   
6
Thermal Expansion
5.90 µm/(m·K)   
99+
60.40 µm/(m·K)   
5
Enthalpy
  
  
Enthalpy of Vaporization
661.10 kJ/mol   
5
56.90 kJ/mol   
99+
Enthalpy of Fusion
25.10 kJ/mol   
8
2.29 kJ/mol   
99+
Enthalpy of Atomization
703.00 kJ/mol   
5
61.50 kJ/mol   
99+
Standard Molar Entropy
43.60 J/mol.K   
34
75.80 J/mol.K   
6
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