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Mercury vs Hafnium

Mercury
Hafnium
Hafnium vs Mercury


Periodic Table
Symbol
Hg  
Hf  
Group Number
12  
6
4  
14
Period Number
6  
6  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7439976  
99+
7440586  
30
Space Group Name
R_ 3m  
P63/mmc  
Space Group Number
166.00  
9
194.00  
7
Facts
Interesting Facts
  • 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.
  
  • Hafnium metal is highly reactive, hence not found free in nature.
  • Hafnium metal as predicated after Mendeleev finished his periodic table.
  
Sources
Mining, Ores of Minerals  
By-product Zirconium Refining  
History
  
  
Who Discovered
Ancient Chinese and Indians  
Dirk Coster and George de Hevesy  
Discovery
Before 2000 BCE  
In 1922  
Abundance
  
  
Abundance In Universe
0.09 %  
2
0.00 %  
26
Abundance In Sun
0.00 %  
30
0.00 %  
26
Abundance In Meteorites
0.00 %  
99+
0.00 %  
37
Abundance In Earth's Crust
0.05 %  
9
0.00 %  
31
Abundance In Oceans
-  
0.00 %  
27
Abundance In Humans
0.00 %  
24
0.00 %  
14
Uses
Uses & Benefits
  • 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.
  
  • 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
Electrical Industry, Electronic Industry  
Ammunition Industry  
Medical Uses
Dentistry  
-  
Other Uses
Alloys, Mirror Manufacturing, Pharmaceutical Industry  
Alloys, In Nuclear Reactors, Nuclear Research, Research Purposes  
Biological Properties
  
  
Toxicity
Highly Toxic  
Toxic  
Present in Human Body
Yes  
No  
In Blood
0.01 Blood/mg dm-3  
23
0.00 Blood/mg dm-3  
40
In Bone
0.45 p.p.m.  
23
0.00 p.p.m.  
99+
Physical
Melting Point
-38.83 °C  
99+
2,150.00 °C  
10
Boiling Point
356.58 °C  
99+
5,400.00 °C  
5
Appearance
  
  
Physical State
Liquid  
Solid  
Color
Silver  
Gray  
Luster
-  
Metallic  
Hardness
  
  
Mohs Hardness
1.50  
19
5.50  
7
Brinell Hardness
5.00 MPa  
99+
1,450.00 MPa  
6
Vickers Hardness
0.00 MPa  
99+
1,520.00 MPa  
10
Speed of Sound
1,451.40 m/s  
99+
3,010.00 m/s  
39
Optical Properties
  
  
Refractive Index
1.00  
99+
2.00  
15
Reflectivity
73.00 %  
10
71.00 %  
12
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Hg  
Hf  
Isotopes
  
  
Known Isotopes
34  
5
32  
7
Electronegativity
  
  
Pauling Electronegativity
2.00  
8
1.30  
33
Sanderson Electronegativity
2.20  
8
1.30  
25
Allred Rochow Electronegativity
1.44  
18
1.23  
26
Mulliken-Jaffe Electronegativity
1.81  
17
1.30  
33
Allen Electronegativity
1.44  
34
1.16  
99+
Electropositivity
  
  
Pauling Electropositivity
2.00  
99+
2.70  
22
Ionization Energies
  
  
1st Energy Level
1,007.10 kJ/mol  
4
658.50 kJ/mol  
40
2nd Energy Level
1,810.00 kJ/mol  
21
1,440.00 kJ/mol  
99+
3rd Energy Level
3,300.00 kJ/mol  
20
2,250.00 kJ/mol  
99+
4th Energy Level
1,007.10 kJ/mol  
99+
3,216.00 kJ/mol  
99+
5th Energy Level
1,007.00 kJ/mol  
99+
6,585.00 kJ/mol  
33
6th Energy Level
1,007.00 kJ/mol  
99+
6,585.00 kJ/mol  
99+
7th Energy level
1,007.00 kJ/mol  
99+
6,580.00 kJ/mol  
99+
8th Energy Level
1,007.00 kJ/mol  
99+
6,580.00 kJ/mol  
99+
9th Energy Level
1,007.00 kJ/mol  
99+
6,585.00 kJ/mol  
38
10th Energy Level
1,007.00 kJ/mol  
99+
6,590.00 kJ/mol  
40
11th Energy Level
1,007.00 kJ/mol  
99+
6,585.00 kJ/mol  
40
12th Energy Level
1,007.00 kJ/mol  
99+
6,580.00 kJ/mol  
99+
13th Energy Level
1,007.00 kJ/mol  
99+
6,580.00 kJ/mol  
35
14th Energy Level
1,007.00 kJ/mol  
99+
658.50 kJ/mol  
99+
15th Energy Level
100,700.00 kJ/mol  
1
65,800.00 kJ/mol  
34
16th Energy Level
1,007.00 kJ/mol  
99+
658.50 kJ/mol  
99+
17th Energy Level
1,007.00 kJ/mol  
24
658.50 kJ/mol  
99+
18th Energy Level
1,007.00 kJ/mol  
99+
6,585.00 kJ/mol  
36
19th Energy Level
1,007.10 kJ/mol  
20
658.50 kJ/mol  
99+
20th Energy Level
1,007.00 kJ/mol  
11
658.00 kJ/mol  
37
21st Energy Level
1,007.00 kJ/mol  
33
658.50 kJ/mol  
99+
22nd Energy Level
1,007.00 kJ/mol  
8
658.00 kJ/mol  
31
23rd Energy Level
1,007.00 kJ/mol  
36
658.50 kJ/mol  
99+
24th Energy Level
1,007.10 kJ/mol  
3
658.50 kJ/mol  
31
25th Energy Level
1,007.10 kJ/mol  
3
658.00 kJ/mol  
33
26th Energy Level
1,007.10 kJ/mol  
3
658.50 kJ/mol  
32
27th Energy Level
1,007.10 kJ/mol  
2
658.50 kJ/mol  
33
28th Energy Level
1,007.10 kJ/mol  
5
658.50 kJ/mol  
38
29th Energy Level
1,007.10 kJ/mol  
6
658.50 kJ/mol  
39
30th Energy Level
1,007.10 kJ/mol  
3
658.00 kJ/mol  
35
Electrochemical Equivalent
3.74 g/amp-hr  
10
1.66 g/amp-hr  
99+
Electron Work Function
4.49 eV  
20
3.90 eV  
36
Other Chemical Properties
Flammability, Ionization, Solubility  
Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
80  
36
72  
99+
Electron Configuration
[Xe] 4f14 5d10 6s2  
[Xe] 4f14 5d2 6s2  
Crystal Structure
Rhombohedral (RHO)  
Hexagonal Close Packed (HCP)  
Crystal Lattice
RHO-Crystal-Structure-of-Mercury.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
80  
36
72  
99+
Number of Neutrons
121  
23
106  
30
Number of Electrons
80  
36
72  
99+
Radius of an Atom
  
  
Atomic Radius
151.00 pm  
34
159.00 pm  
30
Covalent Radius
132.00 pm  
99+
175.00 pm  
25
Van der Waals Radius
155.00 pm  
99+
200.00 pm  
35
Atomic Weight
200.59 amu  
32
178.49 amu  
39
Atomic Volume
14.82 cm3/mol  
99+
13.60 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Gold
  
Lutetium
  
Next Element
Thallium
  
Tantalum
  
Valence Electron Potential
28.20 (-eV)  
99+
81.00 (-eV)  
16
Lattice Constant
300.50 pm  
99+
319.64 pm  
99+
Lattice Angles
-  
π/2, π/2, 2 π/3  
Lattice C/A Ratio
0.42  
99+
1.58  
34
Mechanical
Density
  
  
Density At Room Temperature
13.53 g/cm3  
25
13.31 g/cm3  
27
Density When Liquid (at m.p.)
13.55 g/cm3  
27
12.00 g/cm3  
31
Tensile Strength
15.00 MPa  
99+
445.00 MPa  
9
Viscosity
0.00  
4
0.00  
28
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
37
Vapor Pressure at 2000 K
0.00 (Pa)  
99+
0.00 (Pa)  
25
Elasticity properties
  
  
Shear Modulus
30.00 GPa  
27
30.00 GPa  
27
Bulk Modulus
25.00 GPa  
99+
110.00 GPa  
15
Young's Modulus
45.00 GPa  
99+
78.00 GPa  
27
Poisson Ratio
0.44  
3
0.37  
7
Other Mechanical Properties
-  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
13.53  
27
13.31  
30
Magnetic Ordering
Diamagnetic  
Paramagnetic  
Permeability
0.00 H/m  
10
0.00 H/m  
9
Susceptibility
0.00  
20
0.00  
13
Electrical Properties
  
  
Electrical Property
Conductor  
Conductor  
Resistivity
961.00 nΩ·m  
1
331.00 nΩ·m  
14
Electrical Conductivity
0.01 106/cm Ω  
99+
0.03 106/cm Ω  
99+
Electron Affinity
0.00 kJ/mol  
99+
0.00 kJ/mol  
99+
Thermal
Specific Heat
0.14 J/(kg K)  
39
0.14 J/(kg K)  
38
Molar Heat Capacity
27.98 J/mol·K  
16
25.73 J/mol·K  
99+
Thermal Conductivity
8.30 W/m·K  
99+
23.00 W/m·K  
99+
Critical Temperature
1,750.00 K  
33
2,500.00 K  
11
Thermal Expansion
60.40 µm/(m·K)  
5
5.90 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
56.90 kJ/mol  
99+
661.10 kJ/mol  
6
Enthalpy of Fusion
2.29 kJ/mol  
99+
25.10 kJ/mol  
8
Enthalpy of Atomization
61.50 kJ/mol  
99+
703.00 kJ/mol  
5
Standard Molar Entropy
75.80 J/mol.K  
6
43.60 J/mol.K  
99+
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