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Beryllium vs Potassium

Beryllium
Potassium
Potassium vs Beryllium


Periodic Table
Symbol
Be   
K   
Group Number
2   
16
1   
17
Period Number
2   
4   
Block
s block   
s block   
Element Family
Alkaline Earth   
Alkali   
CAS Number
7440417   
99+
7440097   
99+
Space Group Name
P63/mmc   
Im_ 3m   
Space Group Number
194.00   
5
229.00   
1
Facts
Interesting Facts
  • Beryllium is best anti corrosion metal.
  • Beryllium is the lightest metal and still it is stronger than steel.
  • It also finds various applications in Nuclear reactors as a reflector.
  
  • In the list of most abundant element Potassium is ranked 7th.
  • Potassium can easily be sliced (chopped) down using knife.
  
Sources
Earth's crust, Found in Minerals, Mining, Ores of metals, Ores of Minerals   
Found in Minerals, Mining   
History
  
  
Who Discovered
Louis Nicolas Vauquelin   
Humphry Davy   
Discovery
In 1797   
In 1807   
Abundance
  
  
Abundance In Universe
1 * 10-7 %   
23
3 * 10-4 %   
9
Abundance In Sun
~0.00000001 %   
29
~0.0004 %   
9
Abundance In Meteorites
0.00 %   
99+
0.07 %   
9
Abundance In Earth's Crust
0.00 %   
35
1.50 %   
6
Abundance In Oceans
0.00 %   
39
0.04 %   
3
Abundance In Humans
0.00 %   
19
0.20 %   
2
Uses
Uses & Benefits
  • Its alloys with copper or nickel are used in manufacturing Gyroscopes, springs, electrical contact and non sparking tools.
  • Beryllium Alloys are used as a material for aircraft, missiles, spacecraft and satellite.
  
  • 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.
  
Industrial Uses
Aerospace Industry, Ammunition Industry, Automobile Industry, Electrical Industry, Electronic Industry   
Ammunition Industry, Chemical Industry   
Medical Uses
NA   
Pharmaceutical Industry   
Other Uses
Alloys   
NA   
Biological Properties
  
  
Toxicity
Toxic   
Toxic   
Present in Human Body
Yes   
Yes   
In Blood
0.00 Blood/mg dm-3   
32
1,620.00 Blood/mg dm-3   
2
In Bone
0.00 p.p.m.   
32
2,100.00 p.p.m.   
3
Physical Properties
Melting Point
1,278.00 °C   
36
63.65 °C   
99+
Boiling Point
2,970.00 °C   
32
774.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
White Gray   
Silvery Gray   
Luster
Metallic   
NA   
Hardness
  
  
Mohs Hardness
5.50   
7
0.40   
23
Brinell Hardness
590.00 MPa   
21
0.36 MPa   
99+
Vickers Hardness
1,670.00 MPa   
4
Not Available   
Speed of Sound
12,890.00 m/s   
2
2,000.00 m/s   
99+
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
Be   
K   
Isotopes
  
  
Known Isotopes
9   
29
20   
19
Electronegativity
  
  
Pauling Electronegativity
1.57   
24
0.82   
99+
Sanderson Electronegativity
1.81   
12
0.45   
31
Allred Rochow Electronegativity
1.47   
14
0.91   
39
Mulliken-Jaffe Electronegativity
1.54   
12
0.73   
23
Allen Electronegativity
1.58   
23
0.73   
99+
Electropositivity
  
  
Pauling Electropositivity
2.43   
30
3.18   
3
Ionization Energies
  
  
1st Energy Level
899.50 kJ/mol   
7
418.80 kJ/mol   
99+
2nd Energy Level
1,757.10 kJ/mol   
23
3,052.00 kJ/mol   
5
3rd Energy Level
14,848.70 kJ/mol   
2
4,420.00 kJ/mol   
8
4th Energy Level
21,006.60 kJ/mol   
2
5,877.00 kJ/mol   
9
5th Energy Level
Not Available   
7,975.00 kJ/mol   
8
6th Energy Level
Not Available   
9,590.00 kJ/mol   
13
7th Energy level
Not Available   
11,343.00 kJ/mol   
17
8th Energy Level
Not Available   
14,944.00 kJ/mol   
13
9th Energy Level
Not Available   
16,963.70 kJ/mol   
15
10th Energy Level
Not Available   
48,610.00 kJ/mol   
3
11th Energy Level
Not Available   
54,490.00 kJ/mol   
4
12th Energy Level
Not Available   
60,730.00 kJ/mol   
4
13th Energy Level
Not Available   
68,950.00 kJ/mol   
4
14th Energy Level
Not Available   
75,900.00 kJ/mol   
5
15th Energy Level
Not Available   
83,080.00 kJ/mol   
6
16th Energy Level
Not Available   
93,400.00 kJ/mol   
7
17th Energy Level
Not Available   
99,710.00 kJ/mol   
8
Electrochemical Equivalent
0.17 g/amp-hr   
99+
1.46 g/amp-hr   
99+
Electron Work Function
4.98 eV   
6
2.30 eV   
99+
Other Chemical Properties
Corrosion, Ionization, Radioactive Isotopes   
Chemical Stability, Flammability, Ionization, Solubility   
Atomic Properties
Atomic Number
4   
99+
19   
99+
Electron Configuration
[He] 2s2   
[Ar] 4s1   
Crystal Structure
Hexagonal Close Packed (HCP)   
Body Centered Cubic (BCC)   
Crystal Lattice
HCP-Crystal-Structure-of-Beryllium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
4   
99+
19   
99+
Number of Neutrons
5   
99+
20   
99+
Number of Electrons
4   
99+
19   
99+
Radius of an Atom
  
  
Atomic Radius
112.00 pm   
99+
227.00 pm   
3
Covalent Radius
96.00 pm   
99+
203.00 pm   
9
Van der Waals Radius
153.00 pm   
99+
275.00 pm   
5
Atomic Weight
9.01 amu   
99+
39.10 amu   
99+
Atomic Volume
5.00 cm3/mol   
99+
45.46 cm3/mol   
3
Adjacent Atomic Numbers
  
  
Previous Element
Lithium
  
Aluminium
  
Next Element
Sodium
  
Calcium
  
Valence Electron Potential
82.00 (-eV)   
15
10.40 (-eV)   
99+
Lattice Constant
228.58 pm   
99+
532.80 pm   
12
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, π/2   
Lattice C/A Ratio
1.57   
18
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
1.85 g/cm3   
99+
0.86 g/cm3   
99+
Density When Liquid (at m.p.)
1.69 g/cm3   
99+
0.83 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
0.00 (Pa)   
19
Not Available   
Elasticity properties
  
  
Shear Modulus
132.00 GPa   
7
1.30 GPa   
99+
Bulk Modulus
130.00 GPa   
13
3.10 GPa   
99+
Young's Modulus
287.00 GPa   
7
3.53 GPa   
99+
Poisson Ratio
0.03   
35
Not Available   
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
1.85   
99+
0.86   
99+
Magnetic Ordering
Diamagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Semiconductor   
Conductor   
Resistivity
36.00 nΩ·m   
99+
72.00 nΩ·m   
37
Electrical Conductivity
0.31 106/cm Ω   
5
0.14 106/cm Ω   
14
Electron Affinity
0.00 kJ/mol   
40
48.40 kJ/mol   
22
Thermal Properties
Specific Heat
1.82 J/(kg K)   
2
0.75 J/(kg K)   
6
Molar Heat Capacity
16.44 J/mol·K   
99+
29.60 J/mol·K   
6
Thermal Conductivity
200.00 W/m·K   
6
102.50 W/m·K   
15
Critical Temperature
Not Available   
2,223.00 K   
3
Thermal Expansion
11.30 µm/(m·K)   
34
83.30 µm/(m·K)   
3
Enthalpy
  
  
Enthalpy of Vaporization
294.70 kJ/mol   
30
77.50 kJ/mol   
99+
Enthalpy of Fusion
11.72 kJ/mol   
30
2.32 kJ/mol   
99+
Enthalpy of Atomization
326.40 kJ/mol   
30
89.50 kJ/mol   
99+
Standard Molar Entropy
9.50 J/mol.K   
99+
64.70 J/mol.K   
18
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