Chromium vs Sodium
Periodic Table
Symbol
Cr
Na
Group Number
6
12
1
17
Period Number
4
3
Block
d block
s block
Element Family
Transition Metal
Alkali
CAS Number
7440473
39
7440235
99+
Space Group Name
Im_ 3m
Im_ 3m
Space Group Number
229.00
1
229.00
1
Facts
Interesting Facts
- 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.
- 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).
Sources
Found in Minerals, Mining, Ores of metals, Ores of Minerals
By Electrolysis Process, Mining
History
Who Discovered
Louis Nicolas Vauquelin
Humphry Davy
Discovery
In Between 1797 - 1798
In 1807
Abundance
Abundance In Universe
1.5 * 10-3 %
7
2 * 10-3 %
6
Abundance In Sun
~0.002 %
7
~0.004 %
6
Abundance In Meteorites
0.30 %
7
0.55 %
6
Abundance In Earth's Crust
0.01 %
13
2.30 %
5
Abundance In Oceans
0.00 %
16
1.10 %
1
Abundance In Humans
0.00 %
16
0.14 %
3
Uses
Uses & Benefits
- 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.
- In some nuclear reactors sodium is used as a heat exchanger.
- Compound of Sodium metals called Salt (Sodium chloride) is used in Food.
Industrial Uses
Automobile Industry, Chemical Industry
Electrical Industry, Electronic Industry
Medical Uses
NA
Pharmaceutical Industry
Other Uses
Alloys
Alloys
Biological Properties
Toxicity
Highly Toxic
Toxic
Present in Human Body
Yes
Yes
In Blood
0.11 Blood/mg dm-3
12
1,970.00 Blood/mg dm-3
1
In Bone
0.33 p.p.m.
21
10,000.00 p.p.m.
2
Physical Properties
Melting Point
1,857.00 °C
14
97.72 °C
99+
Boiling Point
2,672.00 °C
39
883.00 °C
99+
Appearance
Physical State
Solid
Solid
Color
Silver
Silvery White
Luster
Metallic
Metallic
Hardness
Mohs Hardness
8.50
1
0.50
22
Brinell Hardness
687.00 MPa
16
0.69 MPa
99+
Vickers Hardness
1,060.00 MPa
10
Not Available
Speed of Sound
5,940.00 m/s
5
3,200.00 m/s
24
Optical Properties
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
Cr
Na
Isotopes
Known Isotopes
21
18
17
22
Electronegativity
Pauling Electronegativity
1.66
18
0.93
99+
Sanderson Electronegativity
1.66
14
0.56
30
Allred Rochow Electronegativity
1.56
10
1.01
35
Mulliken-Jaffe Electronegativity
Not Available
0.91
21
Allen Electronegativity
1.65
19
0.87
99+
Electropositivity
Pauling Electropositivity
2.34
36
3.07
6
Ionization Energies
1st Energy Level
26,130.00 kJ/mol
1
495.80 kJ/mol
99+
2nd Energy Level
28,750.00 kJ/mol
1
4,562.00 kJ/mol
4
3rd Energy Level
34,230.00 kJ/mol
1
6,910.30 kJ/mol
6
4th Energy Level
37,066.00 kJ/mol
1
9,543.00 kJ/mol
5
5th Energy Level
97,510.00 kJ/mol
1
13,354.00 kJ/mol
4
6th Energy Level
105,800.00 kJ/mol
1
16,613.00 kJ/mol
4
7th Energy level
114,300.00 kJ/mol
1
20,117.00 kJ/mol
4
8th Energy Level
125,300.00 kJ/mol
1
25,496.00 kJ/mol
4
9th Energy Level
134,700.00 kJ/mol
1
28,932.00 kJ/mol
4
10th Energy Level
144,300.00 kJ/mol
1
141,362.00 kJ/mol
2
11th Energy Level
26,130.00 kJ/mol
12
159,076.00 kJ/mol
2
12th Energy Level
28,750.00 kJ/mol
13
Not Available
13th Energy Level
34,230.00 kJ/mol
10
Not Available
14th Energy Level
37,066.00 kJ/mol
12
Not Available
15th Energy Level
97,510.00 kJ/mol
1
Not Available
16th Energy Level
105,800.00 kJ/mol
2
Not Available
17th Energy Level
114,300.00 kJ/mol
3
Not Available
18th Energy Level
125,300.00 kJ/mol
4
Not Available
19th Energy Level
134,700.00 kJ/mol
5
Not Available
20th Energy Level
144,300.00 kJ/mol
7
Not Available
21st Energy Level
157,700.00 kJ/mol
7
Not Available
22nd Energy Level
166,090.00 kJ/mol
6
Not Available
Electrochemical Equivalent
0.32 g/amp-hr
99+
0.86 g/amp-hr
99+
Electron Work Function
4.50 eV
14
2.75 eV
40
Other Chemical Properties
Anti Corrosion, Chemical Stability, Ionization, Radioactive Isotopes, Solubility
Chemical Stability, Corrosion, Flammability, Ionization, Solubility
Atomic Properties
Atomic Number
24
99+
11
99+
Electron Configuration
[Ar] 3d5 4s1
[Ne] 3s1
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
24
99+
11
99+
Number of Neutrons
28
99+
12
99+
Number of Electrons
24
99+
11
99+
Radius of an Atom
Atomic Radius
128.00 pm
99+
186.00 pm
9
Covalent Radius
139.00 pm
99+
166.00 pm
27
Van der Waals Radius
200.00 pm
28
227.00 pm
21
Atomic Weight
52.00 amu
99+
22.99 amu
99+
Atomic Volume
7.23 cm3/mol
99+
23.70 cm3/mol
10
Adjacent Atomic Numbers
Valence Electron Potential
170.00 (-eV)
4
14.10 (-eV)
99+
Lattice Constant
291.00 pm
99+
429.06 pm
19
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
7.19 g/cm3
99+
0.97 g/cm3
99+
Density When Liquid (at m.p.)
6.30 g/cm3
40
0.93 g/cm3
99+
Tensile Strength
689.00 MPa
7
Not Available
Viscosity
Not Available
Not Available
Vapor Pressure
Vapor Pressure at 1000 K
0.00 (Pa)
24
Not Available
Vapor Pressure at 2000 K
774.00 (Pa)
1
Not Available
Elasticity properties
Shear Modulus
115.00 GPa
9
3.30 GPa
99+
Bulk Modulus
160.00 GPa
11
6.30 GPa
99+
Young's Modulus
279.00 GPa
8
10.00 GPa
99+
Poisson Ratio
0.21
32
Not Available
Other Mechanical Properties
NA
NA
Magnetic Properties
Magnetic Characteristics
Specific Gravity
7.19
99+
0.97
99+
Magnetic Ordering
Antiferromagnetic
Paramagnetic
Electrical Properties
Electrical Property
NA
Conductor
Resistivity
125.00 nΩ·m
27
47.70 nΩ·m
99+
Electrical Conductivity
0.08 106/cm Ω
25
0.21 106/cm Ω
9
Electron Affinity
64.30 kJ/mol
15
52.80 kJ/mol
19
Thermal Properties
Specific Heat
0.45 J/(kg K)
12
1.23 J/(kg K)
3
Molar Heat Capacity
23.35 J/mol·K
99+
28.23 J/mol·K
10
Thermal Conductivity
93.90 W/m·K
17
142.00 W/m·K
11
Critical Temperature
Not Available
2,573.00 K
2
Thermal Expansion
4.90 µm/(m·K)
99+
71.00 µm/(m·K)
4
Enthalpy
Enthalpy of Vaporization
348.80 kJ/mol
24
89.04 kJ/mol
99+
Enthalpy of Fusion
15.31 kJ/mol
20
2.59 kJ/mol
99+
Enthalpy of Atomization
397.50 kJ/mol
21
108.40 kJ/mol
99+
Standard Molar Entropy
23.80 J/mol.K
99+
51.30 J/mol.K
28
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