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Cadmium vs Silver

Cadmium
Silver
Silver vs Cadmium


Periodic Table
Symbol
Cd  
Ag  
Group Number
12  
6
11  
7
Period Number
5  
5  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7440439  
99+
7440224  
99+
Space Group Name
P63/mmc  
Fm_ 3m  
Space Group Number
194.00  
7
225.00  
3
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.
  
  • It is the most reflective element.
  • Silver is the second most ductile metal after Gold.
  • It is also used in Dentistry as a dental alloys for clips and crowning.
  
Sources
Found As a By-product, Found in Minerals, Mining  
Earth's crust, Found in Minerals, Ores of metals  
History
  
  
Who Discovered
Karl Samuel Leberecht Hermann and Friedrich Stromeyer  
-  
Discovery
In 1817  
Before 5000 BC  
Abundance
  
  
Abundance In Universe
0.00 %  
23
0.00 %  
27
Abundance In Sun
0.00 %  
21
0.00 %  
26
Abundance In Meteorites
0.00 %  
31
0.00 %  
38
Abundance In Earth's Crust
0.00 %  
99+
0.00 %  
99+
Abundance In Oceans
0.00 %  
28
0.00 %  
19
Abundance In Humans
0.00 %  
12
0.00 %  
24
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.
  
  • Silver is mainly used for Jewelry and show piece.
  • It is used for manufacturing high quality mirrors due to its reflectivity property.
  
Industrial Uses
Aerospace Industry, Ammunition Industry, Chemical Industry, Electrical Industry, Electronic Industry  
Chemical Industry, Clothing Industry, Electrical Industry  
Medical Uses
-  
Dentistry, Pharmaceutical Industry  
Other Uses
Alloys  
Alloys, Bullion, Coinage, Jewellery, Sculptures, Statues  
Biological Properties
  
  
Toxicity
Toxic  
Non Toxic  
Present in Human Body
Yes  
Yes  
In Blood
0.01 Blood/mg dm-3  
24
0.00 Blood/mg dm-3  
29
In Bone
1.80 p.p.m.  
16
0.44 p.p.m.  
24
Physical
Melting Point
320.90 °C  
99+
961.93 °C  
99+
Boiling Point
765.00 °C  
99+
2,212.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery Bluish-Gray  
Silvery White  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
2.00  
17
2.50  
15
Brinell Hardness
203.00 MPa  
99+
251.00 MPa  
99+
Vickers Hardness
90.00 MPa  
99+
229.00 MPa  
99+
Speed of Sound
2,310.00 m/s  
99+
2,680.00 m/s  
99+
Optical Properties
  
  
Refractive Index
1.71  
26
0.16  
99+
Reflectivity
67.00 %  
16
97.00 %  
1
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Cd  
Ag  
Isotopes
  
  
Known Isotopes
34  
5
36  
3
Electronegativity
  
  
Pauling Electronegativity
1.69  
18
1.93  
10
Sanderson Electronegativity
1.98  
11
1.83  
14
Allred Rochow Electronegativity
1.46  
16
1.42  
19
Mulliken-Jaffe Electronegativity
1.53  
25
1.47  
28
Allen Electronegativity
1.52  
30
1.87  
10
Electropositivity
  
  
Pauling Electropositivity
2.31  
37
2.07  
99+
Ionization Energies
  
  
1st Energy Level
867.80 kJ/mol  
11
731.00 kJ/mol  
27
2nd Energy Level
1,631.40 kJ/mol  
33
2,070.00 kJ/mol  
11
3rd Energy Level
3,616.00 kJ/mol  
13
3,361.00 kJ/mol  
19
4th Energy Level
867.80 kJ/mol  
99+
7,310.00 kJ/mol  
10
5th Energy Level
4,040.00 kJ/mol  
99+
7,310.00 kJ/mol  
24
6th Energy Level
8,640.00 kJ/mol  
28
7,310.00 kJ/mol  
39
7th Energy level
8,640.00 kJ/mol  
24
7,310.00 kJ/mol  
33
8th Energy Level
8,640.00 kJ/mol  
24
7,310.00 kJ/mol  
31
9th Energy Level
8,670.00 kJ/mol  
22
7,310.00 kJ/mol  
27
10th Energy Level
8,650.00 kJ/mol  
25
7,310.00 kJ/mol  
32
11th Energy Level
8,670.00 kJ/mol  
22
7,310.00 kJ/mol  
31
12th Energy Level
86,400.00 kJ/mol  
3
7,310.00 kJ/mol  
99+
13th Energy Level
8,640.00 kJ/mol  
17
7,310.00 kJ/mol  
25
14th Energy Level
8,650.00 kJ/mol  
15
731.00 kJ/mol  
99+
15th Energy Level
86,400.00 kJ/mol  
10
73,100.00 kJ/mol  
22
16th Energy Level
86,400.00 kJ/mol  
10
73,100.00 kJ/mol  
17
17th Energy Level
864.90 kJ/mol  
28
731.00 kJ/mol  
38
18th Energy Level
8,670.00 kJ/mol  
17
7,310.00 kJ/mol  
28
19th Energy Level
867.80 kJ/mol  
26
731.00 kJ/mol  
35
20th Energy Level
865.00 kJ/mol  
16
731.00 kJ/mol  
29
21st Energy Level
8,670.00 kJ/mol  
10
731.00 kJ/mol  
99+
22nd Energy Level
864.00 kJ/mol  
14
731.00 kJ/mol  
23
23rd Energy Level
864.90 kJ/mol  
40
731.00 kJ/mol  
99+
24th Energy Level
864.90 kJ/mol  
10
731.00 kJ/mol  
22
25th Energy Level
864.00 kJ/mol  
8
731.00 kJ/mol  
22
26th Energy Level
864.90 kJ/mol  
8
731.00 kJ/mol  
22
27th Energy Level
864.90 kJ/mol  
8
731.00 kJ/mol  
21
28th Energy Level
864.90 kJ/mol  
11
731.00 kJ/mol  
27
29th Energy Level
864.90 kJ/mol  
12
731.00 kJ/mol  
28
30th Energy Level
864.00 kJ/mol  
8
731.00 kJ/mol  
22
Electrochemical Equivalent
2.10 g/amp-hr  
31
4.02 g/amp-hr  
7
Electron Work Function
4.22 eV  
29
4.26 eV  
27
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility  
Chemical Stability, Ionization, Solubility  
Atomic
Atomic Number
48  
99+
47  
99+
Electron Configuration
[Kr] 4d10 5s2  
[Kr] 4d10 5s1  
Crystal Structure
Hexagonal Close Packed (HCP)  
Face Centered Cubic (FCC)  
Crystal Lattice
HCP-Crystal-Structure-of-Cadmium.jpg#100  
FCC-Crystal-Structure-of-Silver.jpg#100  
Atom
  
  
Number of Protons
48  
99+
47  
99+
Number of Neutrons
64  
99+
61  
99+
Number of Electrons
48  
99+
47  
99+
Radius of an Atom
  
  
Atomic Radius
151.00 pm  
34
144.00 pm  
38
Covalent Radius
144.00 pm  
99+
145.00 pm  
99+
Van der Waals Radius
158.00 pm  
99+
172.00 pm  
99+
Atomic Weight
112.41 amu  
99+
107.87 amu  
99+
Atomic Volume
13.10 cm3/mol  
99+
10.30 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Silver
  
Palladium
  
Next Element
Indium
  
Cadmium
  
Valence Electron Potential
30.00 (-eV)  
99+
11.40 (-eV)  
99+
Lattice Constant
297.94 pm  
99+
408.53 pm  
23
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.89  
2
1.59  
26
Mechanical
Density
  
  
Density At Room Temperature
8.65 g/cm3  
99+
10.49 g/cm3  
37
Density When Liquid (at m.p.)
8.00 g/cm3  
99+
9.32 g/cm3  
99+
Tensile Strength
62.00 MPa  
34
170.00 MPa  
21
Viscosity
0.00  
13
0.00  
23
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
22
0.00 (Pa)  
14
Vapor Pressure at 2000 K
0.00 (Pa)  
24
0.00 (Pa)  
38
Elasticity properties
  
  
Shear Modulus
19.00 GPa  
99+
30.00 GPa  
27
Bulk Modulus
42.00 GPa  
34
100.00 GPa  
16
Young's Modulus
50.00 GPa  
39
83.00 GPa  
25
Poisson Ratio
0.30  
14
0.37  
7
Other Mechanical Properties
Ductile, Malleable  
Ductile, Malleable  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
8.65  
99+
10.50  
39
Magnetic Ordering
Diamagnetic  
Diamagnetic  
Permeability
0.00 H/m  
10
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
32
Electrical Properties
  
  
Electrical Property
Semiconductor  
Conductor  
Resistivity
72.70 nΩ·m  
36
15.87 nΩ·m  
99+
Electrical Conductivity
0.14 106/cm Ω  
17
0.63 106/cm Ω  
1
Electron Affinity
0.00 kJ/mol  
99+
125.60 kJ/mol  
5
Thermal
Specific Heat
0.23 J/(kg K)  
26
0.24 J/(kg K)  
25
Molar Heat Capacity
26.02 J/mol·K  
40
25.35 J/mol·K  
99+
Thermal Conductivity
96.60 W/m·K  
16
429.00 W/m·K  
1
Critical Temperature
594.00 K  
99+
1,235.00 K  
99+
Thermal Expansion
30.80 µm/(m·K)  
10
18.90 µm/(m·K)  
25
Enthalpy
  
  
Enthalpy of Vaporization
100.00 kJ/mol  
99+
255.10 kJ/mol  
99+
Enthalpy of Fusion
6.19 kJ/mol  
99+
11.30 kJ/mol  
37
Enthalpy of Atomization
113.00 kJ/mol  
99+
284.50 kJ/mol  
99+
Standard Molar Entropy
51.80 J/mol.K  
38
42.60 J/mol.K  
99+
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