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Iron vs Chromium

Iron
Chromium
Chromium vs Iron


Periodic Table
Symbol
Fe   
Cr   
Group Number
8   
10
6   
12
Period Number
4   
4   
Block
d block   
d block   
Element Family
Transition Metal   
Transition Metal   
CAS Number
7439896   
99+
7440473   
39
Space Group Name
Im_ 3m   
Im_ 3m   
Space Group Number
229.00   
1
229.00   
1
Facts
Interesting Facts
  • Iron is not always magnetic in nature, its allotrope are ferromagnetic and the B allotrope is nonmagnetic.
  • The blood consists Iron in hemoglobin molecules to transfer Oxygen in the body.
  
  • 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   
Found in Minerals, Mining, Ores of metals, Ores of Minerals   
History
  
  
Who Discovered
Unknown   
Louis Nicolas Vauquelin   
Discovery
Before 5000 BC   
In Between 1797 - 1798   
Abundance
  
  
Abundance In Universe
1.1 * 10-1 %   
1
1.5 * 10-3 %   
7
Abundance In Sun
~0.1 %   
1
~0.002 %   
7
Abundance In Meteorites
22.00 %   
1
0.30 %   
7
Abundance In Earth's Crust
6.30 %   
2
0.01 %   
13
Abundance In Oceans
0.00 %   
12
0.00 %   
16
Abundance In Humans
0.01 %   
5
0.00 %   
16
Uses
Uses & Benefits
  • Iron metal alloy steel is used in the application of civil engineering and manufacturing.
  • Alloys of iron with nickel, vanadium, chromium, tungsten and manganese have very useful properties.
  
  • 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
Aerospace Industry, Automobile Industry, Chemical Industry, Electrical Industry, Electronic Industry   
Automobile Industry, Chemical Industry   
Medical Uses
Pharmaceutical Industry, Surgical Instruments Manufacturing   
NA   
Other Uses
Alloys, Sculptures, Statues   
Alloys   
Biological Properties
  
  
Toxicity
Non Toxic   
Highly Toxic   
Present in Human Body
Yes   
Yes   
In Blood
447.00 Blood/mg dm-3   
3
0.11 Blood/mg dm-3   
12
In Bone
380.00 p.p.m.   
5
0.33 p.p.m.   
21
Physical Properties
Melting Point
1,535.00 °C   
25
1,857.00 °C   
14
Boiling Point
2,750.00 °C   
37
2,672.00 °C   
39
Appearance
  
  
Physical State
Solid   
Solid   
Color
Gray   
Silver   
Luster
Metallic   
Metallic   
Hardness
  
  
Mohs Hardness
4.00   
10
8.50   
1
Brinell Hardness
200.00 MPa   
40
687.00 MPa   
16
Vickers Hardness
608.00 MPa   
18
1,060.00 MPa   
10
Speed of Sound
5,120.00 m/s   
8
5,940.00 m/s   
5
Optical Properties
  
  
Reflectivity
65.00 %   
12
Not Available   
Allotropes
Yes   
No   
α Allotropes
Ferrite (alpha Iron)   
Not Available   
β Allotropes
beta Iron   
Not Available   
γ Allotropes
gamma Iron   
Not Available   
Chemical Properties
Chemical Formula
Fe   
Cr   
Isotopes
  
  
Known Isotopes
26   
13
21   
18
Electronegativity
  
  
Pauling Electronegativity
1.83   
14
1.66   
18
Sanderson Electronegativity
2.20   
7
1.66   
14
Allred Rochow Electronegativity
1.64   
8
1.56   
10
Allen Electronegativity
1.80   
12
1.65   
19
Electropositivity
  
  
Pauling Electropositivity
2.17   
40
2.34   
36
Ionization Energies
  
  
1st Energy Level
762.50 kJ/mol   
17
26,130.00 kJ/mol   
1
2nd Energy Level
1,561.90 kJ/mol   
36
28,750.00 kJ/mol   
1
3rd Energy Level
2,957.00 kJ/mol   
29
34,230.00 kJ/mol   
1
4th Energy Level
5,290.00 kJ/mol   
16
37,066.00 kJ/mol   
1
5th Energy Level
7,240.00 kJ/mol   
16
97,510.00 kJ/mol   
1
6th Energy Level
9,560.00 kJ/mol   
14
105,800.00 kJ/mol   
1
7th Energy level
12,060.00 kJ/mol   
15
114,300.00 kJ/mol   
1
8th Energy Level
14,580.00 kJ/mol   
14
125,300.00 kJ/mol   
1
9th Energy Level
22,540.00 kJ/mol   
5
134,700.00 kJ/mol   
1
10th Energy Level
25,290.00 kJ/mol   
8
144,300.00 kJ/mol   
1
11th Energy Level
28,000.00 kJ/mol   
9
26,130.00 kJ/mol   
12
12th Energy Level
31,920.00 kJ/mol   
9
28,750.00 kJ/mol   
13
13th Energy Level
34,830.00 kJ/mol   
9
34,230.00 kJ/mol   
10
14th Energy Level
37,840.00 kJ/mol   
11
37,066.00 kJ/mol   
12
15th Energy Level
44,100.00 kJ/mol   
11
97,510.00 kJ/mol   
1
16th Energy Level
47,206.00 kJ/mol   
13
105,800.00 kJ/mol   
2
17th Energy Level
122,200.00 kJ/mol   
1
114,300.00 kJ/mol   
3
18th Energy Level
131,000.00 kJ/mol   
2
125,300.00 kJ/mol   
4
19th Energy Level
140,500.00 kJ/mol   
3
134,700.00 kJ/mol   
5
20th Energy Level
152,600.00 kJ/mol   
5
144,300.00 kJ/mol   
7
21st Energy Level
163,000.00 kJ/mol   
5
157,700.00 kJ/mol   
7
22nd Energy Level
173,600.00 kJ/mol   
4
166,090.00 kJ/mol   
6
23rd Energy Level
188,100.00 kJ/mol   
4
Not Available   
24th Energy Level
195,200.00 kJ/mol   
1
Not Available   
Electrochemical Equivalent
0.69 g/amp-hr   
99+
0.32 g/amp-hr   
99+
Electron Work Function
4.70 eV   
10
4.50 eV   
14
Other Chemical Properties
Corrosion, Ionization, Solubility   
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
26   
99+
24   
99+
Electron Configuration
[Ar] 3d6 4s2   
[Ar] 3d5 4s1   
Crystal Structure
Body Centered Cubic (BCC)   
Body Centered Cubic (BCC)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
26   
99+
24   
99+
Number of Neutrons
30   
99+
28   
99+
Number of Electrons
26   
99+
24   
99+
Radius of an Atom
  
  
Atomic Radius
126.00 pm   
99+
128.00 pm   
99+
Covalent Radius
132.00 pm   
99+
139.00 pm   
99+
Van der Waals Radius
200.00 pm   
28
200.00 pm   
28
Atomic Weight
55.85 amu   
99+
52.00 amu   
99+
Atomic Volume
7.10 cm3/mol   
99+
7.23 cm3/mol   
99+
Adjacent Atomic Numbers
  
  
Previous Element
Manganese
  
Vanadium
  
Next Element
Cobalt
  
Manganese
  
Valence Electron Potential
67.00 (-eV)   
20
170.00 (-eV)   
4
Lattice Constant
286.65 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
7.87 g/cm3   
99+
7.19 g/cm3   
99+
Density When Liquid (at m.p.)
6.98 g/cm3   
35
6.30 g/cm3   
40
Tensile Strength
11,000.00 MPa   
1
689.00 MPa   
7
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
28
0.00 (Pa)   
24
Vapor Pressure at 2000 K
36.80 (Pa)   
5
774.00 (Pa)   
1
Elasticity properties
  
  
Shear Modulus
82.00 GPa   
11
115.00 GPa   
9
Bulk Modulus
170.00 GPa   
10
160.00 GPa   
11
Young's Modulus
211.00 GPa   
9
279.00 GPa   
8
Poisson Ratio
0.29   
15
0.21   
32
Other Mechanical Properties
Ductile, Malleable, Weldable   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
7.20   
99+
7.19   
99+
Magnetic Ordering
Ferromagnetic   
Antiferromagnetic   
Permeability
6.3 * 10-3 H/m   
1
Not Available   
Susceptibility
2,00,000.00   
1
Not Available   
Electrical Properties
  
  
Electrical Property
Conductor   
NA   
Resistivity
96.10 nΩ·m   
32
125.00 nΩ·m   
27
Electrical Conductivity
0.10 106/cm Ω   
20
0.08 106/cm Ω   
25
Electron Affinity
15.70 kJ/mol   
34
64.30 kJ/mol   
15
Thermal Properties
Specific Heat
0.44 J/(kg K)   
13
0.45 J/(kg K)   
12
Molar Heat Capacity
25.10 J/mol·K   
99+
23.35 J/mol·K   
99+
Thermal Conductivity
80.40 W/m·K   
22
93.90 W/m·K   
17
Critical Temperature
Not Available   
Not Available   
Thermal Expansion
11.80 µm/(m·K)   
33
4.90 µm/(m·K)   
99+
Enthalpy
  
  
Enthalpy of Vaporization
351.00 kJ/mol   
23
348.80 kJ/mol   
24
Enthalpy of Fusion
14.90 kJ/mol   
22
15.31 kJ/mol   
20
Enthalpy of Atomization
414.20 kJ/mol   
19
397.50 kJ/mol   
21
Standard Molar Entropy
27.30 J/mol.K   
99+
23.80 J/mol.K   
99+
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