Symbol
K
  
Mn
  
Period Number
4
  
4
  
Block
s block
  
d block
  
Element Family
Alkali
  
Transition Metal
  
Space Group Name
Im_ 3m
  
I_ 43m
  
Interesting Facts
- In the list of most abundant element Potassium is ranked 7th.
- Potassium can easily be sliced (chopped) down using knife.
  
- Manganese is an essential trace element in all forms of life.
- Manganese metal oxidizes very easily, but it does not fuse that easily.
  
Sources
Found in Minerals, Mining
  
Found in Minerals, Mining, Ores of Minerals
  
History
  
  
Who Discovered
Humphry Davy
  
Johann Gottlieb Gahn
  
Discovery
In 1807
  
In 1774
  
Abundance
  
  
Abundance In Earth's Crust
Uses & Benefits
- Potassium’s compounds are in high demand for their application in Fertilizer manufacturing.
- Potassium carbonate is used in glass manufacturing and Potassium carbonate in manufacturing detergent and body wash.
  
- This metal is very brittle hence it mostly not used as a pure metal, but its alloys are very useful
- Its alloy Manganese steel is extremely strong and used in railway tracks, safes, prison bars and riffle barrels.
  
Industrial Uses
Ammunition Industry, Chemical Industry
  
Automobile Industry, Electrical Industry, Electronic Industry
  
Medical Uses
Pharmaceutical Industry
  
NA
  
Other Uses
NA
  
Alloys
  
Biological Properties
  
  
Toxicity
Toxic
  
Toxic
  
Present in Human Body
Yes
  
Yes
  
In Blood
1,620.00 Blood/mg dm-3
  
2
0.08 Blood/mg dm-3
  
14
In Bone
2,100.00 p.p.m.
  
3
100.00 p.p.m.
  
8
Melting Point
1,245.00 °C
  
37
Boiling Point
1,962.00 °C
  
99+
Appearance
  
  
Physical State
Solid
  
Solid
  
Color
Silvery Gray
  
Silver
  
Luster
NA
  
Metallic
  
Hardness
  
  
Brinell Hardness
196.00 MPa
  
99+
Speed of Sound
2,000.00 m/s
  
99+
5,150.00 m/s
  
7
Optical Properties
  
  
Allotropes
No
  
No
  
α Allotropes
Not Available
  
Not Available
  
β Allotropes
Not Available
  
Not Available
  
γ Allotropes
Not Available
  
Not Available
  
Chemical Formula
K
  
Mn
  
Isotopes
  
  
Electronegativity
  
  
Pauling Electronegativity
Sanderson Electronegativity
Allred Rochow Electronegativity
Mulliken-Jaffe Electronegativity
Not Available
  
Electropositivity
  
  
Pauling Electropositivity
Ionization Energies
  
  
1st Energy Level
418.80 kJ/mol
  
99+
717.30 kJ/mol
  
30
2nd Energy Level
3,052.00 kJ/mol
  
5
1,509.00 kJ/mol
  
39
3rd Energy Level
4,420.00 kJ/mol
  
8
3,248.00 kJ/mol
  
21
4th Energy Level
5,877.00 kJ/mol
  
9
4,940.00 kJ/mol
  
20
5th Energy Level
7,975.00 kJ/mol
  
8
6,990.00 kJ/mol
  
17
6th Energy Level
9,590.00 kJ/mol
  
13
9,220.00 kJ/mol
  
16
7th Energy level
11,343.00 kJ/mol
  
17
11,500.00 kJ/mol
  
16
8th Energy Level
14,944.00 kJ/mol
  
13
18,770.00 kJ/mol
  
5
9th Energy Level
16,963.70 kJ/mol
  
15
21,400.00 kJ/mol
  
6
10th Energy Level
48,610.00 kJ/mol
  
3
23,960.00 kJ/mol
  
9
11th Energy Level
54,490.00 kJ/mol
  
4
27,590.00 kJ/mol
  
10
12th Energy Level
60,730.00 kJ/mol
  
4
30,330.00 kJ/mol
  
10
13th Energy Level
68,950.00 kJ/mol
  
4
33,150.00 kJ/mol
  
11
14th Energy Level
75,900.00 kJ/mol
  
5
38,880.00 kJ/mol
  
10
15th Energy Level
83,080.00 kJ/mol
  
6
41,987.00 kJ/mol
  
13
16th Energy Level
93,400.00 kJ/mol
  
7
109,480.00 kJ/mol
  
1
17th Energy Level
99,710.00 kJ/mol
  
8
118,100.00 kJ/mol
  
2
18th Energy Level
Not Available
  
127,100.00 kJ/mol
  
3
19th Energy Level
Not Available
  
138,600.00 kJ/mol
  
4
20th Energy Level
Not Available
  
148,500.00 kJ/mol
  
6
21st Energy Level
Not Available
  
158,600.00 kJ/mol
  
6
22nd Energy Level
Not Available
  
172,500.00 kJ/mol
  
5
23rd Energy Level
Not Available
  
181,380.00 kJ/mol
  
5
Electrochemical Equivalent
1.46 g/amp-hr
  
99+
0.29 g/amp-hr
  
99+
Other Chemical Properties
Chemical Stability, Flammability, Ionization, Solubility
  
Ionization, Radioactive Isotopes
  
Electron Configuration
[Ar] 4s1
  
[Ar] 3d5 4s2
  
Crystal Structure
Body Centered Cubic (BCC)
  
Body Centered Cubic (BCC)
  
Crystal Lattice
BCC-Crystal-Structure-.jpg#100
  
BCC-Crystal-Structure-.jpg#100
  
Atom
  
  
Radius of an Atom
  
  
Atomic Volume
45.46 cm3/mol
  
3
1.39 cm3/mol
  
99+
Adjacent Atomic Numbers
  
  
Valence Electron Potential
10.40 (-eV)
  
99+
220.00 (-eV)
  
2
Lattice Angles
π/2, π/2, π/2
  
π/2, π/2, π/2
  
Lattice C/A Ratio
Not Available
  
Not Available
  
Density
  
  
Density At Room Temperature
0.86 g/cm3
  
99+
7.21 g/cm3
  
99+
Density When Liquid (at m.p.)
0.83 g/cm3
  
99+
5.95 g/cm3
  
99+
Tensile Strength
Not Available
  
Not Available
  
Viscosity
Not Available
  
Not Available
  
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available
  
Elasticity properties
  
  
Shear Modulus
Not Available
  
Poisson Ratio
Not Available
  
Not Available
  
Other Mechanical Properties
NA
  
NA
  
Magnetic Characteristics
  
  
Magnetic Ordering
Paramagnetic
  
Paramagnetic
  
Electrical Properties
  
  
Electrical Property
Conductor
  
Conductor
  
Electrical Conductivity
0.14 106/cm Ω
  
14
0.01 106/cm Ω
  
99+
Electron Affinity
48.40 kJ/mol
  
22
0.00 kJ/mol
  
40
Specific Heat
0.75 J/(kg K)
  
6
0.48 J/(kg K)
  
11
Molar Heat Capacity
29.60 J/mol·K
  
6
26.32 J/mol·K
  
29
Thermal Conductivity
102.50 W/m·K
  
15
7.81 W/m·K
  
99+
Critical Temperature
Not Available
  
Thermal Expansion
83.30 µm/(m·K)
  
3
21.70 µm/(m·K)
  
21
Enthalpy
  
  
Enthalpy of Vaporization
77.50 kJ/mol
  
99+
219.70 kJ/mol
  
99+
Enthalpy of Fusion
2.32 kJ/mol
  
99+
14.64 kJ/mol
  
23
Enthalpy of Atomization
89.50 kJ/mol
  
99+
280.30 kJ/mol
  
38
Standard Molar Entropy
64.70 J/mol.K
  
18
32.00 J/mol.K
  
99+