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Nickel vs Chromium

Nickel
Chromium
Chromium vs Nickel


Periodic Table
Symbol
Ni   
Cr   
Group Number
10   
8
6   
12
Period Number
4   
4   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7440020   
99+
7440473   
39
Space Group Name
Fm_ 3m   
Im_ 3m   
Space Group Number
225.00   
2
229.00   
1
Facts
Interesting Facts
  • Zinc metal found (obtain) in many forms like granules, foil, dust and in a powder form.
  • After iron, Zinc metal the second most abundant element in the earth crust.
  
  • 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
Axel Fredrik Cronstedt   
Louis Nicolas Vauquelin   
Discovery
In 1751   
In Between 1797 - 1798   
Abundance
  
  
Abundance In Universe
6 * 10-3 %   
4
1.5 * 10-3 %   
7
Abundance In Sun
~0.008 %   
3
~0.002 %   
7
Abundance In Meteorites
1.30 %   
3
0.30 %   
7
Abundance In Earth's Crust
0.01 %   
15
0.01 %   
13
Abundance In Oceans
0.00 %   
13
0.00 %   
16
Abundance In Humans
0.00 %   
14
0.00 %   
16
Uses
Uses & Benefits
  • It has corrosion resistance and hence it is used to plate other metals.
  • Its alloys are very useful; Nichrome alloy is used in the hot coil of toasters and electric oven.
  
  • 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, Electrical Industry, Electronic Industry   
Automobile Industry, Chemical Industry   
Medical Uses
NA   
NA   
Other Uses
Alloys   
Alloys   
Biological Properties
  
  
Toxicity
Toxic   
Highly Toxic   
Present in Human Body
Yes   
Yes   
In Blood
0.05 Blood/mg dm-3   
17
0.11 Blood/mg dm-3   
12
In Bone
0.70 p.p.m.   
18
0.33 p.p.m.   
21
Physical Properties
Melting Point
1,453.00 °C   
31
1,857.00 °C   
14
Boiling Point
2,732.00 °C   
38
2,672.00 °C   
39
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silver   
Silver   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
4.00   
10
8.50   
1
Brinell Hardness
667.00 MPa   
18
687.00 MPa   
16
Vickers Hardness
638.00 MPa   
16
1,060.00 MPa   
10
Speed of Sound
4,900.00 m/s   
12
5,940.00 m/s   
5
Optical Properties
  
  
Reflectivity
72.00 %   
9
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
Ni   
Cr   
Isotopes
  
  
Known Isotopes
25   
14
21   
18
Electronegativity
  
  
Pauling Electronegativity
1.91   
10
1.66   
18
Sanderson Electronegativity
1.94   
10
1.66   
14
Allred Rochow Electronegativity
1.75   
3
1.56   
10
Allen Electronegativity
1.88   
6
1.65   
19
Electropositivity
  
  
Pauling Electropositivity
2.09   
99+
2.34   
36
Ionization Energies
  
  
1st Energy Level
737.10 kJ/mol   
25
26,130.00 kJ/mol   
1
2nd Energy Level
1,753.00 kJ/mol   
25
28,750.00 kJ/mol   
1
3rd Energy Level
3,395.00 kJ/mol   
17
34,230.00 kJ/mol   
1
4th Energy Level
5,300.00 kJ/mol   
15
37,066.00 kJ/mol   
1
5th Energy Level
7,339.00 kJ/mol   
15
97,510.00 kJ/mol   
1
6th Energy Level
10,400.00 kJ/mol   
9
105,800.00 kJ/mol   
1
7th Energy level
12,800.00 kJ/mol   
10
114,300.00 kJ/mol   
1
8th Energy Level
15,600.00 kJ/mol   
10
125,300.00 kJ/mol   
1
9th Energy Level
18,600.00 kJ/mol   
10
134,700.00 kJ/mol   
1
10th Energy Level
21,670.00 kJ/mol   
14
144,300.00 kJ/mol   
1
11th Energy Level
30,970.00 kJ/mol   
7
26,130.00 kJ/mol   
12
12th Energy Level
34,000.00 kJ/mol   
7
28,750.00 kJ/mol   
13
13th Energy Level
37,100.00 kJ/mol   
7
34,230.00 kJ/mol   
10
14th Energy Level
41,500.00 kJ/mol   
8
37,066.00 kJ/mol   
12
15th Energy Level
44,800.00 kJ/mol   
10
97,510.00 kJ/mol   
1
16th Energy Level
48,100.00 kJ/mol   
12
105,800.00 kJ/mol   
2
17th Energy Level
55,101.00 kJ/mol   
11
114,300.00 kJ/mol   
3
18th Energy Level
58,570.00 kJ/mol   
12
125,300.00 kJ/mol   
4
19th Energy Level
148,700.00 kJ/mol   
1
134,700.00 kJ/mol   
5
20th Energy Level
159,000.00 kJ/mol   
3
144,300.00 kJ/mol   
7
21st Energy Level
169,400.00 kJ/mol   
3
157,700.00 kJ/mol   
7
22nd Energy Level
182,700.00 kJ/mol   
2
166,090.00 kJ/mol   
6
23rd Energy Level
194,000.00 kJ/mol   
2
Not Available   
Electrochemical Equivalent
1.10 g/amp-hr   
99+
0.32 g/amp-hr   
99+
Electron Work Function
5.15 eV   
2
4.50 eV   
14
Other Chemical Properties
Anti Corrosion, Ionization, Radioactive Isotopes   
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
28   
99+
24   
99+
Electron Configuration
[Ar] 3d8 4s2 Or [Ar] 3d9 4s1   
[Ar] 3d5 4s1   
Crystal Structure
Face Centered Cubic (FCC)   
Body Centered Cubic (BCC)   
Crystal Lattice
FCC-Crystal-Structure-of-Nickel.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
28   
99+
24   
99+
Number of Neutrons
31   
99+
28   
99+
Number of Electrons
28   
99+
24   
99+
Radius of an Atom
  
  
Atomic Radius
124.00 pm   
99+
128.00 pm   
99+
Covalent Radius
124.00 pm   
99+
139.00 pm   
99+
Van der Waals Radius
163.00 pm   
40
200.00 pm   
28
Atomic Weight
58.69 amu   
99+
52.00 amu   
99+
Atomic Volume
6.59 cm3/mol   
99+
7.23 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Cobalt
  
Vanadium
  
Next Element
Copper
  
Manganese
  
Valence Electron Potential
42.00 (-eV)   
99+
170.00 (-eV)   
4
Lattice Constant
352.40 pm   
99+
291.00 pm   
99+
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
8.91 g/cm3   
99+
7.19 g/cm3   
99+
Density When Liquid (at m.p.)
7.81 g/cm3   
29
6.30 g/cm3   
40
Tensile Strength
345.00 MPa   
11
689.00 MPa   
7
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
31
0.00 (Pa)   
24
Vapor Pressure at 2000 K
19.50 (Pa)   
6
774.00 (Pa)   
1
Elasticity properties
  
  
Shear Modulus
76.00 GPa   
12
115.00 GPa   
9
Bulk Modulus
180.00 GPa   
9
160.00 GPa   
11
Young's Modulus
200.00 GPa   
11
279.00 GPa   
8
Poisson Ratio
0.31   
13
0.21   
32
Other Mechanical Properties
Ductile   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
8.90   
33
7.19   
99+
Magnetic Ordering
Ferromagnetic   
Antiferromagnetic   
Permeability
0.00 H/m   
2
Not Available   
Susceptibility
600.00   
2
Not Available   
Electrical Properties
  
  
Electrical Property
Conductor   
NA   
Resistivity
69.30 nΩ·m   
39
125.00 nΩ·m   
27
Electrical Conductivity
0.14 106/cm Ω   
13
0.08 106/cm Ω   
25
Electron Affinity
112.00 kJ/mol   
6
64.30 kJ/mol   
15
Thermal Properties
Specific Heat
0.44 J/(kg K)   
13
0.45 J/(kg K)   
12
Molar Heat Capacity
26.07 J/mol·K   
31
23.35 J/mol·K   
99+
Thermal Conductivity
90.90 W/m·K   
18
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
371.80 kJ/mol   
20
348.80 kJ/mol   
24
Enthalpy of Fusion
17.57 kJ/mol   
14
15.31 kJ/mol   
20
Enthalpy of Atomization
422.60 kJ/mol   
17
397.50 kJ/mol   
21
Standard Molar Entropy
29.90 J/mol.K   
99+
23.80 J/mol.K   
99+
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