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Sodium vs Chromium

Sodium
Chromium
Chromium vs Sodium


Periodic Table
Symbol
-  
Cr  
Group Number
1  
17
6  
12
Period Number
3  
4  
Block
s block  
d block  
Element Family
Alkali  
Transition Metal  
CAS Number
7440235  
99+
7440473  
39
Space Group Name
Im_ 3m  
Im_ 3m  
Space Group Number
229.00  
2
229.00  
2
Facts
Interesting Facts
  • At room temperature Sodium metal is very soft as it can be chopped down into pieces with butter knife.
  • The most common compound of Sodium is NaCl (Salt).
  
  • 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
By Electrolysis Process, Mining  
Found in Minerals, Mining, Ores of metals, Ores of Minerals  
History
  
  
Who Discovered
Humphry Davy  
Louis Nicolas Vauquelin  
Discovery
In 1807  
In Between 1797 - 1798  
Abundance
  
  
Abundance In Universe
0.00 %  
7
0.00 %  
8
Abundance In Sun
0.00 %  
6
0.00 %  
7
Abundance In Meteorites
0.55 %  
6
0.30 %  
7
Abundance In Earth's Crust
2.30 %  
5
0.01 %  
13
Abundance In Oceans
1.10 %  
1
0.00 %  
16
Abundance In Humans
0.14 %  
4
0.00 %  
19
Uses
Uses & Benefits
  • In some nuclear reactors sodium is used as a heat exchanger.
  • Compound of Sodium metals called Salt (Sodium chloride) is used in Food.
  
  • 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
Toxic  
Highly Toxic  
Present in Human Body
Yes  
Yes  
In Blood
1,970.00 Blood/mg dm-3  
1
0.11 Blood/mg dm-3  
12
In Bone
10,000.00 p.p.m.  
2
0.33 p.p.m.  
25
Physical
Melting Point
97.72 °C  
99+
1,857.00 °C  
14
Boiling Point
883.00 °C  
99+
2,672.00 °C  
99+
Appearance
  
  
Physical State
Solid  
Solid  
Color
Silvery White  
Silver  
Luster
Metallic  
Metallic  
Hardness
  
  
Mohs Hardness
0.50  
24
8.50  
1
Brinell Hardness
0.69 MPa  
99+
687.00 MPa  
18
Vickers Hardness
0.69 MPa  
99+
1,060.00 MPa  
17
Speed of Sound
3,200.00 m/s  
35
5,940.00 m/s  
8
Optical Properties
  
  
Refractive Index
1.33  
99+
2.97  
2
Reflectivity
53.00 %  
28
70.00 %  
13
Allotropes
No  
No  
α Allotropes
-  
-  
β Allotropes
-  
-  
γ Allotropes
-  
-  
Chemical
Chemical Formula
-  
Cr  
Isotopes
  
  
Known Isotopes
17  
22
21  
18
Electronegativity
  
  
Pauling Electronegativity
0.93  
99+
1.66  
19
Sanderson Electronegativity
0.56  
99+
1.66  
17
Allred Rochow Electronegativity
1.01  
36
1.56  
11
Mulliken-Jaffe Electronegativity
0.91  
99+
1.66  
19
Allen Electronegativity
0.87  
99+
1.65  
22
Electropositivity
  
  
Pauling Electropositivity
3.07  
6
2.34  
36
Ionization Energies
  
  
1st Energy Level
495.80 kJ/mol  
99+
26,130.00 kJ/mol  
1
2nd Energy Level
4,562.00 kJ/mol  
4
28,750.00 kJ/mol  
1
3rd Energy Level
6,910.30 kJ/mol  
6
34,230.00 kJ/mol  
1
4th Energy Level
9,543.00 kJ/mol  
5
37,066.00 kJ/mol  
1
5th Energy Level
13,354.00 kJ/mol  
4
97,510.00 kJ/mol  
1
6th Energy Level
16,613.00 kJ/mol  
4
105,800.00 kJ/mol  
1
7th Energy level
20,117.00 kJ/mol  
4
114,300.00 kJ/mol  
1
8th Energy Level
25,496.00 kJ/mol  
4
125,300.00 kJ/mol  
1
9th Energy Level
28,932.00 kJ/mol  
4
134,700.00 kJ/mol  
1
10th Energy Level
141,362.00 kJ/mol  
2
144,300.00 kJ/mol  
1
11th Energy Level
159,076.00 kJ/mol  
2
26,130.00 kJ/mol  
12
12th Energy Level
4,950.00 kJ/mol  
99+
28,750.00 kJ/mol  
36
13th Energy Level
4,950.00 kJ/mol  
99+
34,230.00 kJ/mol  
10
14th Energy Level
495.80 kJ/mol  
99+
37,066.00 kJ/mol  
12
15th Energy Level
49,500.00 kJ/mol  
99+
97,510.00 kJ/mol  
2
16th Energy Level
49,500.00 kJ/mol  
99+
105,800.00 kJ/mol  
2
17th Energy Level
495.80 kJ/mol  
99+
114,300.00 kJ/mol  
3
18th Energy Level
4,960.00 kJ/mol  
99+
125,300.00 kJ/mol  
4
19th Energy Level
495.80 kJ/mol  
99+
134,700.00 kJ/mol  
5
20th Energy Level
496.00 kJ/mol  
99+
144,300.00 kJ/mol  
7
21st Energy Level
495.80 kJ/mol  
99+
157,700.00 kJ/mol  
7
22nd Energy Level
495.00 kJ/mol  
99+
166,090.00 kJ/mol  
6
23rd Energy Level
495.80 kJ/mol  
99+
653.80 kJ/mol  
99+
24th Energy Level
495.80 kJ/mol  
99+
653.80 kJ/mol  
32
25th Energy Level
496.00 kJ/mol  
99+
653.80 kJ/mol  
34
26th Energy Level
495.80 kJ/mol  
99+
653.80 kJ/mol  
33
27th Energy Level
495.80 kJ/mol  
99+
652.90 kJ/mol  
34
28th Energy Level
495.80 kJ/mol  
99+
653.80 kJ/mol  
39
29th Energy Level
495.80 kJ/mol  
99+
653.80 kJ/mol  
40
30th Energy Level
495.80 kJ/mol  
99+
653.80 kJ/mol  
36
Electrochemical Equivalent
0.86 g/amp-hr  
99+
0.32 g/amp-hr  
99+
Electron Work Function
2.75 eV  
99+
4.50 eV  
19
Other Chemical Properties
Chemical Stability, Corrosion, Flammability, Ionization, Solubility  
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility  
Atomic
Atomic Number
11  
99+
24  
99+
Electron Configuration
[Ne] 3s1  
[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
11  
99+
24  
99+
Number of Neutrons
12  
99+
28  
99+
Number of Electrons
11  
99+
24  
99+
Radius of an Atom
  
  
Atomic Radius
186.00 pm  
11
128.00 pm  
99+
Covalent Radius
166.00 pm  
29
139.00 pm  
99+
Van der Waals Radius
227.00 pm  
26
200.00 pm  
35
Atomic Weight
22.99 amu  
99+
52.00 amu  
99+
Atomic Volume
23.70 cm3/mol  
14
7.23 cm3/mol  
99+
Adjacent Atomic Numbers
  
  
Previous Element
Beryllium
  
Vanadium
  
Next Element
Magnesium
  
Manganese
  
Valence Electron Potential
14.10 (-eV)  
99+
170.00 (-eV)  
4
Lattice Constant
429.06 pm  
22
291.00 pm  
99+
Lattice Angles
π/2, π/2, π/2  
π/2, π/2, π/2  
Lattice C/A Ratio
1.01  
99+
1.86  
4
Mechanical
Density
  
  
Density At Room Temperature
0.97 g/cm3  
99+
7.19 g/cm3  
99+
Density When Liquid (at m.p.)
0.93 g/cm3  
99+
6.30 g/cm3  
99+
Tensile Strength
10.00 MPa  
99+
689.00 MPa  
7
Viscosity
0.00  
5
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)  
99+
774.00 (Pa)  
1
Elasticity properties
  
  
Shear Modulus
3.30 GPa  
99+
115.00 GPa  
9
Bulk Modulus
6.30 GPa  
99+
160.00 GPa  
11
Young's Modulus
10.00 GPa  
99+
279.00 GPa  
8
Poisson Ratio
0.37  
7
0.21  
33
Other Mechanical Properties
-  
-  
Magnetic
Magnetic Characteristics
  
  
Specific Gravity
0.97  
99+
7.19  
99+
Magnetic Ordering
Paramagnetic  
Antiferromagnetic  
Permeability
0.00 H/m  
6
0.00 H/m  
17
Susceptibility
0.00  
24
0.00  
10
Electrical Properties
  
  
Electrical Property
Conductor  
-  
Resistivity
47.70 nΩ·m  
99+
125.00 nΩ·m  
27
Electrical Conductivity
0.21 106/cm Ω  
9
0.08 106/cm Ω  
30
Electron Affinity
52.80 kJ/mol  
24
64.30 kJ/mol  
17
Thermal
Specific Heat
1.23 J/(kg K)  
3
0.45 J/(kg K)  
12
Molar Heat Capacity
28.23 J/mol·K  
13
23.35 J/mol·K  
99+
Thermal Conductivity
142.00 W/m·K  
11
93.90 W/m·K  
17
Critical Temperature
2,573.00 K  
10
1,907.00 K  
24
Thermal Expansion
71.00 µm/(m·K)  
4
4.90 µm/(m·K)  
99+
Enthalpy
  
  
Enthalpy of Vaporization
89.04 kJ/mol  
99+
348.80 kJ/mol  
35
Enthalpy of Fusion
2.59 kJ/mol  
99+
15.31 kJ/mol  
20
Enthalpy of Atomization
108.40 kJ/mol  
99+
397.50 kJ/mol  
27
Standard Molar Entropy
51.30 J/mol.K  
39
23.80 J/mol.K  
99+
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