Cadmium vs Bismuth
Periodic Table
Symbol
Cd
Bi
Group Number
12
6
15
3
Period Number
5
6
Block
d block
p block
Element Family
Transition Metal
Post-Transition
CAS Number
7440439
99+
7440699
22
Space Group Name
P63/mmc
C12/m1
Space Group Number
194.00
5
12.00
12
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.
- Bismuth metal is soluble and reacts with concentrated nitric acid.
- It oxides are used as a yellow pigment in paint. Bismuth chloride oxide BiClO gives a pearly texture to cosmetics.
Sources
Found As a By-product, Found in Minerals, Mining
Found in Minerals, Mining, Ores of Minerals
History
Who Discovered
Karl Samuel Leberecht Hermann and Friedrich Stromeyer
Claude François Geoffroy
Discovery
In 1817
In 1753
Abundance
Abundance In Universe
2 * 10-7 %
22
7 * 10-8 %
25
Abundance In Sun
~0.0000006 %
21
~0.000006 %
14
Abundance In Meteorites
0.00 %
31
0.00 %
99+
Abundance In Earth's Crust
0.00 %
99+
0.00 %
99+
Abundance In Oceans
0.00 %
28
0.00 %
24
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.
- Tin and bismuth alloys have a very low melting point and hence it is used in fire detector and the fire extinguishers. It also used in electric solders and fuses.
Industrial Uses
Aerospace Industry, Ammunition Industry, Chemical Industry, Electrical Industry, Electronic Industry
Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry
Medical Uses
NA
Pharmaceutical Industry
Other Uses
Alloys
Alloys
Biological Properties
Toxicity
Toxic
Low Toxic
Present in Human Body
Yes
Yes
In Blood
0.01 Blood/mg dm-3
24
0.02 Blood/mg dm-3
20
In Bone
1.80 p.p.m.
15
0.20 p.p.m.
22
Physical Properties
Melting Point
320.90 °C
99+
271.30 °C
99+
Boiling Point
765.00 °C
99+
1,560.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silvery Bluish-Gray
Silver
Luster
Metallic
Metallic
Hardness
Mohs Hardness
2.00
16
2.25
15
Brinell Hardness
203.00 MPa
39
70.00 MPa
99+
Speed of Sound
2,310.00 m/s
39
1,790.00 m/s
99+
Optical Properties
Reflectivity
67.00 %
11
Not Available
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
Bi
Isotopes
Known Isotopes
34
5
33
6
Electronegativity
Pauling Electronegativity
1.69
17
2.02
6
Sanderson Electronegativity
1.98
9
2.34
3
Allred Rochow Electronegativity
1.46
15
1.67
6
Mulliken-Jaffe Electronegativity
1.53
13
2.15
4
Allen Electronegativity
1.52
27
2.01
4
Electropositivity
Pauling Electropositivity
2.31
37
1.98
99+
Ionization Energies
1st Energy Level
867.80 kJ/mol
11
703.00 kJ/mol
35
2nd Energy Level
1,631.40 kJ/mol
32
1,610.00 kJ/mol
33
3rd Energy Level
3,616.00 kJ/mol
13
2,466.00 kJ/mol
99+
4th Energy Level
Not Available
4,370.00 kJ/mol
28
5th Energy Level
Not Available
5,400.00 kJ/mol
30
6th Energy Level
Not Available
8,520.00 kJ/mol
19
Electrochemical Equivalent
2.10 g/amp-hr
27
2.60 g/amp-hr
19
Electron Work Function
4.22 eV
22
4.22 eV
22
Other Chemical Properties
Chemical Stability, Anti Corrosion, Ionization, Radioactive Isotopes, Solubility
Ionization, Radioactive Isotopes, Solubility
Atomic Properties
Atomic Number
48
99+
83
33
Electron Configuration
[Kr] 4d10 5s2
[Xe] 4f14 5d10 6s2 6p3
Crystal Structure
Hexagonal Close Packed (HCP)
Rhombohedral (RHO)
Crystal Lattice
HCP-Crystal-Structure-of-Cadmium.jpg#100
RHO-Crystal-Structure-of-Bismuth.jpg#100
Atom
Number of Protons
48
99+
83
33
Number of Neutrons
64
99+
126
18
Number of Electrons
48
99+
83
33
Radius of an Atom
Atomic Radius
151.00 pm
32
156.00 pm
29
Covalent Radius
144.00 pm
40
148.00 pm
36
Van der Waals Radius
158.00 pm
99+
207.00 pm
26
Atomic Weight
112.41 amu
99+
208.98 amu
29
Atomic Volume
13.10 cm3/mol
39
21.30 cm3/mol
14
Adjacent Atomic Numbers
Valence Electron Potential
30.00 (-eV)
99+
41.90 (-eV)
99+
Lattice Constant
297.94 pm
99+
667.40 pm
2
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+
9.78 g/cm3
39
Density When Liquid (at m.p.)
8.00 g/cm3
28
10.05 g/cm3
18
Tensile Strength
62.00 MPa
16
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Elasticity properties
Shear Modulus
19.00 GPa
35
12.00 GPa
99+
Bulk Modulus
42.00 GPa
29
31.00 GPa
38
Young's Modulus
50.00 GPa
36
32.00 GPa
99+
Poisson Ratio
0.30
14
0.33
11
Other Mechanical Properties
Ductile, Malleable
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
8.65
36
9.79
30
Magnetic Ordering
Diamagnetic
Diamagnetic
Permeability
Not Available
0.00 H/m
6
Susceptibility
Not Available
0.00
6
Electrical Properties
Electrical Property
Semiconductor
Semiconductor
Resistivity
72.70 nΩ·m
36
1.29 nΩ·m
99+
Electrical Conductivity
0.14 106/cm Ω
15
0.01 106/cm Ω
99+
Electron Affinity
0.00 kJ/mol
40
91.20 kJ/mol
11
Thermal Properties
Specific Heat
0.23 J/(kg K)
26
0.12 J/(kg K)
40
Molar Heat Capacity
26.02 J/mol·K
32
25.52 J/mol·K
37
Thermal Conductivity
96.60 W/m·K
16
7.97 W/m·K
99+
Critical Temperature
Not Available
Not Available
Thermal Expansion
30.80 µm/(m·K)
10
13.40 µm/(m·K)
28
Enthalpy
Enthalpy of Vaporization
100.00 kJ/mol
99+
151.00 kJ/mol
99+
Enthalpy of Fusion
6.19 kJ/mol
99+
10.90 kJ/mol
33
Enthalpy of Atomization
113.00 kJ/mol
99+
207.10 kJ/mol
99+
Standard Molar Entropy
51.80 J/mol.K
27
56.70 J/mol.K
24
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