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Zinc vs Chromium

Zinc
Chromium
Chromium vs Zinc


Periodic Table
Symbol
Zn  
Cr  
Group Number
12  
6
6  
12
Period Number
4  
4  
Block
d block  
d block  
Element Family
Transition Metal  
Transition Metal  
CAS Number
7440666  
24
7440473  
39
Space Group Name
P63/mmc  
Im_ 3m  
Space Group Number
194.00  
7
229.00  
2
Facts
Interesting Facts
  • Zinc metal found (obtain) in many forms like granules, foil, dust and in a powder form.
  • The leading producers of Zinc metal are Australia, Canada, China, U.S.A and Peru.
  
  • 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
Earth's crust, Found in Minerals, Mining, Ores of Minerals  
Found in Minerals, Mining, Ores of metals, Ores of Minerals  
History
  
  
Who Discovered
Indian metallurgists  
Louis Nicolas Vauquelin  
Discovery
Before 1000 BCE  
In Between 1797 - 1798  
Abundance
  
  
Abundance In Universe
0.00 %  
12
0.00 %  
8
Abundance In Sun
0.00 %  
10
0.00 %  
7
Abundance In Meteorites
0.02 %  
12
0.30 %  
7
Abundance In Earth's Crust
0.01 %  
16
0.01 %  
13
Abundance In Oceans
0.00 %  
10
0.00 %  
16
Abundance In Humans
0.00 %  
7
0.00 %  
19
Uses
Uses & Benefits
  • It is mainly used for Galvanizing other metals.
  • It is also used for manufacturing die-casting and it is very essential for automobile industry.
  
  • 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
Electrical Industry, Electronic Industry  
Automobile Industry, Chemical Industry  
Medical Uses
Pharmaceutical Industry  
-  
Other Uses
Alloys  
Alloys  
Biological Properties
  
  
Toxicity
Highly Toxic  
Highly Toxic  
Present in Human Body
Yes  
Yes  
In Blood
7.00 Blood/mg dm-3  
6
0.11 Blood/mg dm-3  
12
In Bone
170.00 p.p.m.  
6
0.33 p.p.m.  
25
Physical
Melting Point
419.58 °C  
99+
1,857.00 °C  
14
Boiling Point
907.00 °C  
99+
2,672.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery Gray  
Silver  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
2.50  
15
8.50  
1
Brinell Hardness
327.00 MPa  
39
687.00 MPa  
18
Vickers Hardness
207.00 MPa  
99+
1,060.00 MPa  
17
Speed of Sound
3,850.00 m/s  
25
5,940.00 m/s  
8
Optical Properties
  
  
Refractive Index
1.00  
99+
2.97  
2
Reflectivity
80.00 %  
7
70.00 %  
13
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
Zn  
Cr  
Isotopes
  
  
Known Isotopes
25  
14
21  
18
Electronegativity
  
  
Pauling Electronegativity
1.65  
20
1.66  
19
Sanderson Electronegativity
2.23  
7
1.66  
17
Allred Rochow Electronegativity
1.66  
8
1.56  
11
Mulliken-Jaffe Electronegativity
1.65  
20
1.66  
19
Allen Electronegativity
1.59  
25
1.65  
22
Electropositivity
  
  
Pauling Electropositivity
2.35  
35
2.34  
36
Ionization Energies
  
  
1st Energy Level
906.40 kJ/mol  
6
26,130.00 kJ/mol  
1
2nd Energy Level
1,733.30 kJ/mol  
28
28,750.00 kJ/mol  
1
3rd Energy Level
3,833.00 kJ/mol  
12
34,230.00 kJ/mol  
1
4th Energy Level
5,731.00 kJ/mol  
20
37,066.00 kJ/mol  
1
5th Energy Level
7,970.00 kJ/mol  
15
97,510.00 kJ/mol  
1
6th Energy Level
10,400.00 kJ/mol  
15
105,800.00 kJ/mol  
1
7th Energy level
12,900.00 kJ/mol  
9
114,300.00 kJ/mol  
1
8th Energy Level
16,800.00 kJ/mol  
6
125,300.00 kJ/mol  
1
9th Energy Level
19,600.00 kJ/mol  
8
134,700.00 kJ/mol  
1
10th Energy Level
23,000.00 kJ/mol  
10
144,300.00 kJ/mol  
1
11th Energy Level
26,400.00 kJ/mol  
11
26,130.00 kJ/mol  
12
12th Energy Level
29,990.00 kJ/mol  
33
28,750.00 kJ/mol  
36
13th Energy Level
40,490.00 kJ/mol  
5
34,230.00 kJ/mol  
10
14th Energy Level
43,800.00 kJ/mol  
6
37,066.00 kJ/mol  
12
15th Energy Level
47,300.00 kJ/mol  
99+
97,510.00 kJ/mol  
2
16th Energy Level
52,300.00 kJ/mol  
99+
105,800.00 kJ/mol  
2
17th Energy Level
55,900.00 kJ/mol  
10
114,300.00 kJ/mol  
3
18th Energy Level
59,700.00 kJ/mol  
11
125,300.00 kJ/mol  
4
19th Energy Level
67,300.00 kJ/mol  
10
134,700.00 kJ/mol  
5
20th Energy Level
171,200.00 kJ/mol  
1
144,300.00 kJ/mol  
7
21st Energy Level
179,100.00 kJ/mol  
1
157,700.00 kJ/mol  
7
22nd Energy Level
906.00 kJ/mol  
9
166,090.00 kJ/mol  
6
23rd Energy Level
906.40 kJ/mol  
37
653.80 kJ/mol  
99+
24th Energy Level
906.40 kJ/mol  
5
653.80 kJ/mol  
32
25th Energy Level
906.40 kJ/mol  
4
653.80 kJ/mol  
34
26th Energy Level
906.40 kJ/mol  
4
653.80 kJ/mol  
33
27th Energy Level
906.40 kJ/mol  
3
652.90 kJ/mol  
34
28th Energy Level
906.40 kJ/mol  
6
653.80 kJ/mol  
39
29th Energy Level
906.40 kJ/mol  
7
653.80 kJ/mol  
40
30th Energy Level
906.40 kJ/mol  
4
653.80 kJ/mol  
36
Electrochemical Equivalent
1.22 g/amp-hr  
99+
0.32 g/amp-hr  
99+
Electron Work Function
4.33 eV  
24
4.50 eV  
19
Other Chemical Properties
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes  
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
30  
99+
24  
99+
Electron Configuration
[Ar] 3d10 4s2  
[Ar] 3d5 4s1  
Crystal Structure
Hexagonal Close Packed (HCP)  
Body Centered Cubic (BCC)  
Crystal Lattice
HCP-Crystal-Structure-of-Zinc.jpg#100  
BCC-Crystal-Structure-.jpg#100  
Atom
  
  
Number of Protons
30  
99+
24  
99+
Number of Neutrons
35  
99+
28  
99+
Number of Electrons
30  
99+
24  
99+
Radius of an Atom
  
  
Atomic Radius
134.00 pm  
99+
128.00 pm  
99+
Covalent Radius
122.00 pm  
99+
139.00 pm  
99+
Van der Waals Radius
139.00 pm  
99+
200.00 pm  
35
Atomic Weight
65.38 amu  
99+
52.00 amu  
99+
Atomic Volume
9.20 cm3/mol  
99+
7.23 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Copper
  
Vanadium
  
Next Element
Gallium
  
Manganese
  
Valence Electron Potential
38.90 (-eV)  
99+
170.00 (-eV)  
4
Lattice Constant
266.49 pm  
99+
291.00 pm  
99+
Lattice Angles
π/2, π/2, 2 π/3  
π/2, π/2, π/2  
Lattice C/A Ratio
1.86  
4
1.86  
4
Mechanical
Density
  
  
Density At Room Temperature
7.14 g/cm3  
99+
7.19 g/cm3  
99+
Density When Liquid (at m.p.)
6.57 g/cm3  
99+
6.30 g/cm3  
99+
Tensile Strength
120.00 MPa  
27
689.00 MPa  
7
Viscosity
0.00  
7
0.00  
23
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)  
37
0.00 (Pa)  
26
Vapor Pressure at 2000 K
0.00 (Pa)  
37
774.00 (Pa)  
1
Elasticity properties
  
  
Shear Modulus
43.00 GPa  
18
115.00 GPa  
9
Bulk Modulus
70.00 GPa  
20
160.00 GPa  
11
Young's Modulus
108.00 GPa  
21
279.00 GPa  
8
Poisson Ratio
0.25  
24
0.21  
33
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
6.90  
99+
7.19  
99+
Magnetic Ordering
Diamagnetic  
Antiferromagnetic  
Permeability
0.00 H/m  
16
0.00 H/m  
17
Susceptibility
0.00  
6
0.00  
10
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
59.00 nΩ·m  
40
125.00 nΩ·m  
27
Electrical Conductivity
0.17 106/cm Ω  
12
0.08 106/cm Ω  
30
Electron Affinity
0.00 kJ/mol  
99+
64.30 kJ/mol  
17
Thermal
Specific Heat
0.39 J/(kg K)  
14
0.45 J/(kg K)  
12
Molar Heat Capacity
25.47 J/mol·K  
99+
23.35 J/mol·K  
99+
Thermal Conductivity
116.00 W/m·K  
14
93.90 W/m·K  
17
Critical Temperature
692.00 K  
99+
1,907.00 K  
24
Thermal Expansion
30.20 µm/(m·K)  
11
4.90 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
7.32 kJ/mol  
99+
348.80 kJ/mol  
35
Enthalpy of Fusion
7.32 kJ/mol  
99+
15.31 kJ/mol  
20
Enthalpy of Atomization
129.70 kJ/mol  
99+
397.50 kJ/mol  
27
Standard Molar Entropy
41.60 J/mol.K  
99+
23.80 J/mol.K  
99+
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