Symbol
Bi
  
Cr
  
Period Number
6
  
4
  
Block
p block
  
d block
  
Element Family
Post-Transition
  
Transition Metal
  
Space Group Name
C12/m1
  
Im_ 3m
  
Interesting Facts
- 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.
  
- Chromium is highly reactive, hence it is not found free in nature.
- Ores of Chromites mineral are the major source of Chromium metal.
- Almost 90% leather tanning is done with the help of chromium.
  
Sources
Found in Minerals, Mining, Ores of Minerals
  
Found in Minerals, Mining, Ores of metals, Ores of Minerals
  
History
  
  
Who Discovered
Claude François Geoffroy
  
Louis Nicolas Vauquelin
  
Discovery
In 1753
  
In Between 1797 - 1798
  
Abundance
  
  
Abundance In Universe
1.5 * 10-3 %
  
7
Abundance In Sun
~0.000006 %
  
14
Abundance In Earth's Crust
Abundance In Humans
Not Available
  
Uses & Benefits
- 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.
  
- It is used to harden the steel and produces a stainless steel and other various alloys.
- It is also used to give proper finish to polished mirrors. Its chromium plates are used in bathroom fittings.
  
Industrial Uses
Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry
  
Automobile Industry, Chemical Industry
  
Medical Uses
Pharmaceutical Industry
  
NA
  
Other Uses
Alloys
  
Alloys
  
Biological Properties
  
  
Toxicity
Low Toxic
  
Highly Toxic
  
Present in Human Body
Yes
  
Yes
  
In Blood
0.02 Blood/mg dm-3
  
20
0.11 Blood/mg dm-3
  
12
In Bone
0.20 p.p.m.
  
22
0.33 p.p.m.
  
21
Melting Point
1,857.00 °C
  
14
Boiling Point
1,560.00 °C
  
99+
2,672.00 °C
  
39
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silver
  
Silver
  
Luster
Metallic
  
Metallic
  
Hardness
  
  
Vickers Hardness
Not Available
  
1,060.00 MPa
  
10
Speed of Sound
1,790.00 m/s
  
99+
5,940.00 m/s
  
5
Optical Properties
  
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
Bi
  
Cr
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
703.00 kJ/mol
  
35
26,130.00 kJ/mol
  
1
2nd Energy Level
1,610.00 kJ/mol
  
33
28,750.00 kJ/mol
  
1
3rd Energy Level
2,466.00 kJ/mol
  
99+
34,230.00 kJ/mol
  
1
4th Energy Level
4,370.00 kJ/mol
  
28
37,066.00 kJ/mol
  
1
5th Energy Level
5,400.00 kJ/mol
  
30
97,510.00 kJ/mol
  
1
6th Energy Level
8,520.00 kJ/mol
  
19
105,800.00 kJ/mol
  
1
7th Energy level
Not Available
  
114,300.00 kJ/mol
  
1
8th Energy Level
Not Available
  
125,300.00 kJ/mol
  
1
9th Energy Level
Not Available
  
134,700.00 kJ/mol
  
1
10th Energy Level
Not Available
  
144,300.00 kJ/mol
  
1
11th Energy Level
Not Available
  
26,130.00 kJ/mol
  
12
12th Energy Level
Not Available
  
28,750.00 kJ/mol
  
13
13th Energy Level
Not Available
  
34,230.00 kJ/mol
  
10
14th Energy Level
Not Available
  
37,066.00 kJ/mol
  
12
15th Energy Level
Not Available
  
97,510.00 kJ/mol
  
1
16th Energy Level
Not Available
  
105,800.00 kJ/mol
  
2
17th Energy Level
Not Available
  
114,300.00 kJ/mol
  
3
18th Energy Level
Not Available
  
125,300.00 kJ/mol
  
4
19th Energy Level
Not Available
  
134,700.00 kJ/mol
  
5
20th Energy Level
Not Available
  
144,300.00 kJ/mol
  
7
21st Energy Level
Not Available
  
157,700.00 kJ/mol
  
7
22nd Energy Level
Not Available
  
166,090.00 kJ/mol
  
6
Electrochemical Equivalent
2.60 g/amp-hr
  
19
0.32 g/amp-hr
  
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility
  
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility
  
Electron Configuration
[Xe] 4f14 5d10 6s2 6p3
  
[Ar] 3d5 4s1
  
Crystal Structure
Rhombohedral (RHO)
  
Body Centered Cubic (BCC)
  
Crystal Lattice
RHO-Crystal-Structure-of-Bismuth.jpg#100
  
BCC-Crystal-Structure-.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Atomic Volume
21.30 cm3/mol
  
14
7.23 cm3/mol
  
99+
Adjacent Atomic Numbers
  
  
Valence Electron Potential
41.90 (-eV)
  
99+
170.00 (-eV)
  
4
Lattice Angles
NA
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Density
  
  
Density At Room Temperature
7.19 g/cm3
  
99+
Density When Liquid (at m.p.)
10.05 g/cm3
  
18
Tensile Strength
Not Available
  
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Vapor Pressure at 2000 K
Not Available
  
Elasticity properties
  
  
Other Mechanical Properties
NA
  
NA
  
Magnetic Characteristics
  
  
Magnetic Ordering
Diamagnetic
  
Antiferromagnetic
  
Permeability
Not Available
  
Susceptibility
Not Available
  
Electrical Properties
  
  
Electrical Property
Semiconductor
  
NA
  
Resistivity
125.00 nΩ·m
  
27
Electrical Conductivity
0.01 106/cm Ω
  
99+
0.08 106/cm Ω
  
25
Electron Affinity
91.20 kJ/mol
  
11
64.30 kJ/mol
  
15
Specific Heat
0.12 J/(kg K)
  
40
0.45 J/(kg K)
  
12
Molar Heat Capacity
25.52 J/mol·K
  
37
23.35 J/mol·K
  
99+
Thermal Conductivity
7.97 W/m·K
  
99+
93.90 W/m·K
  
17
Critical Temperature
Not Available
  
Not Available
  
Thermal Expansion
13.40 µm/(m·K)
  
28
4.90 µm/(m·K)
  
99+
Enthalpy
  
  
Enthalpy of Vaporization
151.00 kJ/mol
  
99+
348.80 kJ/mol
  
24
Enthalpy of Fusion
10.90 kJ/mol
  
33
15.31 kJ/mol
  
20
Enthalpy of Atomization
207.10 kJ/mol
  
99+
397.50 kJ/mol
  
21
Standard Molar Entropy
56.70 J/mol.K
  
24
23.80 J/mol.K
  
99+