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Cadmium vs Mercury

Cadmium
Mercury
Mercury vs Cadmium


Periodic Table
Symbol
Cd   
Hg   
Group Number
12   
6
12   
6
Period Number
5   
6   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7440439   
99+
7439976   
99+
Space Group Name
P63/mmc   
R_ 3m   
Space Group Number
194.00   
5
166.00   
6
Facts
Interesting Facts
  • Naturally occurring minor elements include Cadmium.
  • Cadmium is released into atmosphere to control volcanic eruption and forest fires.
  • It is used for electroplating of Steel for corrosion resistance.
  • It can absorb neutrons and used in nuclear reactor to control atomic fission.
  
  • 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
Found As a By-product, Found in Minerals, Mining   
Mining, Ores of Minerals   
History
  
  
Who Discovered
Karl Samuel Leberecht Hermann and Friedrich Stromeyer   
Ancient Chinese and Indians   
Discovery
In 1817   
Before 2000 BCE   
Abundance
  
  
Abundance In Universe
2 * 10-7 %   
22
Not Available   
Abundance In Sun
~0.0000006 %   
21
~-9999 %   
Abundance In Meteorites
0.00 %   
31
Not Available   
Abundance In Earth's Crust
0.00 %   
99+
0.05 %   
9
Abundance In Oceans
0.00 %   
28
Not Available   
Abundance In Humans
0.00 %   
11
Not Available   
Uses
Uses & Benefits
  • It has very limited uses as it is a toxic metal and it can cause birth defects, cancer, etc.
  • Almost 80% of Cadmium metal is used in Nickel cadmium Batteries and now it is getting replaced with nickel hydride.
  
  • 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
Aerospace Industry, Ammunition Industry, Chemical Industry, Electrical Industry, Electronic Industry   
Electrical Industry, Electronic Industry   
Medical Uses
NA   
Dentistry   
Other Uses
Alloys   
Alloys, Mirror Manufacturing, Pharmaceutical Industry   
Biological Properties
  
  
Toxicity
Toxic   
Highly Toxic   
Present in Human Body
Yes   
Yes   
In Blood
0.01 Blood/mg dm-3   
24
0.01 Blood/mg dm-3   
23
In Bone
1.80 p.p.m.   
15
0.45 p.p.m.   
19
Physical Properties
Melting Point
320.90 °C   
99+
Not Available   
Boiling Point
765.00 °C   
99+
356.58 °C   
99+
Appearance
  
  
Physical State
Solid   
Liquid   
Color
Silvery Bluish-Gray   
Silver   
Luster
Metallic   
NA   
Hardness
  
  
Mohs Hardness
2.00   
16
Not Available   
Brinell Hardness
203.00 MPa   
39
Not Available   
Speed of Sound
2,310.00 m/s   
39
1,451.40 m/s   
99+
Optical Properties
  
  
Refractive Index
Not Available   
1.00   
3
Reflectivity
67.00 %   
11
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
Cd   
Hg   
Isotopes
  
  
Known Isotopes
34   
5
34   
5
Electronegativity
  
  
Pauling Electronegativity
1.69   
17
2.00   
7
Sanderson Electronegativity
1.98   
9
2.20   
7
Allred Rochow Electronegativity
1.46   
15
1.44   
17
Mulliken-Jaffe Electronegativity
1.53   
13
1.81   
9
Allen Electronegativity
1.52   
27
1.44   
30
Electropositivity
  
  
Pauling Electropositivity
2.31   
37
2.00   
99+
Ionization Energies
  
  
1st Energy Level
867.80 kJ/mol   
11
1,007.10 kJ/mol   
4
2nd Energy Level
1,631.40 kJ/mol   
32
1,810.00 kJ/mol   
20
3rd Energy Level
3,616.00 kJ/mol   
13
3,300.00 kJ/mol   
20
Electrochemical Equivalent
2.10 g/amp-hr   
27
3.74 g/amp-hr   
10
Electron Work Function
4.22 eV   
22
4.49 eV   
15
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility   
Flammability, Ionization, Solubility   
Atomic Properties
Atomic Number
48   
99+
80   
36
Electron Configuration
[Kr] 4d10 5s2   
[Xe] 4f14 5d10 6s2   
Crystal Structure
Hexagonal Close Packed (HCP)   
Rhombohedral (RHO)   
Crystal Lattice
HCP-Crystal-Structure-of-Cadmium.jpg#100   
RHO-Crystal-Structure-of-Mercury.jpg#100   
Atom
  
  
Number of Protons
48   
99+
80   
36
Number of Neutrons
64   
99+
121   
22
Number of Electrons
48   
99+
80   
36
Radius of an Atom
  
  
Atomic Radius
151.00 pm   
32
151.00 pm   
32
Covalent Radius
144.00 pm   
40
132.00 pm   
99+
Van der Waals Radius
158.00 pm   
99+
155.00 pm   
99+
Atomic Weight
112.41 amu   
99+
200.59 amu   
32
Atomic Volume
13.10 cm3/mol   
39
14.82 cm3/mol   
35
Adjacent Atomic Numbers
  
  
Previous Element
Silver
  
Gold
  
Next Element
Indium
  
Thallium
  
Valence Electron Potential
30.00 (-eV)   
99+
28.20 (-eV)   
99+
Lattice Constant
297.94 pm   
99+
300.50 pm   
99+
Lattice Angles
π/2, π/2, 2 π/3   
NA   
Lattice C/A Ratio
1.89   
1
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
8.65 g/cm3   
99+
13.53 g/cm3   
24
Density When Liquid (at m.p.)
8.00 g/cm3   
28
Not Available   
Tensile Strength
62.00 MPa   
16
Not Available   
Viscosity
Not Available   
0.00   
1
Vapor Pressure
  
  
Elasticity properties
  
  
Shear Modulus
19.00 GPa   
35
Not Available   
Bulk Modulus
42.00 GPa   
29
Not Available   
Young's Modulus
50.00 GPa   
36
Not Available   
Poisson Ratio
0.30   
14
Not Available   
Other Mechanical Properties
Ductile, Malleable   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
8.65   
36
13.53   
16
Magnetic Ordering
Diamagnetic   
Diamagnetic   
Electrical Properties
  
  
Electrical Property
Semiconductor   
Conductor   
Resistivity
72.70 nΩ·m   
36
961.00 nΩ·m   
1
Electrical Conductivity
0.14 106/cm Ω   
15
0.01 106/cm Ω   
99+
Electron Affinity
0.00 kJ/mol   
40
0.00 kJ/mol   
40
Thermal Properties
Specific Heat
0.23 J/(kg K)   
26
0.14 J/(kg K)   
38
Molar Heat Capacity
26.02 J/mol·K   
32
27.98 J/mol·K   
13
Thermal Conductivity
96.60 W/m·K   
16
8.30 W/m·K   
99+
Critical Temperature
Not Available   
1,750.00 K   
6
Thermal Expansion
30.80 µm/(m·K)   
10
60.40 µm/(m·K)   
5
Enthalpy
  
  
Enthalpy of Vaporization
100.00 kJ/mol   
99+
56.90 kJ/mol   
99+
Enthalpy of Fusion
6.19 kJ/mol   
99+
2.29 kJ/mol   
99+
Enthalpy of Atomization
113.00 kJ/mol   
99+
61.50 kJ/mol   
99+
Standard Molar Entropy
51.80 J/mol.K   
27
75.80 J/mol.K   
6
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