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Potassium vs Scandium

Potassium
Scandium
Scandium vs Potassium


Periodic Table
Symbol
K   
Sc   
Group Number
1   
17
3   
15
Period Number
4   
4   
Block
s block   
d block   
Element Family
Alkali   
Transition Metal   
CAS Number
7440097   
99+
7440202   
99+
Space Group Name
Im_ 3m   
P63/mmc   
Space Group Number
229.00   
1
194.00   
5
Facts
Interesting Facts
  • In the list of most abundant element Potassium is ranked 7th.
  • Potassium can easily be sliced (chopped) down using knife.
  
  • Scandium is known as one of the rare earth elements.
  • Scandium metal found in rare minerals called Wolframite .
  
Sources
Found in Minerals, Mining   
Found in Minerals, Mining, Ores of metals, Ores of Minerals   
History
  
  
Who Discovered
Humphry Davy   
Lars Fredrik Nilson   
Discovery
In 1807   
In 1879   
Abundance
  
  
Abundance In Universe
3 * 10-4 %   
9
3 * 10-6 %   
15
Abundance In Sun
~0.0004 %   
9
~0.000004 %   
16
Abundance In Meteorites
0.07 %   
9
0.00 %   
18
Abundance In Earth's Crust
1.50 %   
6
0.00 %   
23
Abundance In Oceans
0.04 %   
3
0.00 %   
32
Abundance In Humans
0.20 %   
2
Not Available   
Uses
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.
  
  • Uses of Scandium are limited to research purpose only. However, it has very low density and higher melting point.
  • Its compounds like scandium iodide is used in mercury vapor lamps to produce very bright white light.
  
Industrial Uses
Ammunition Industry, Chemical Industry   
Electrical Industry, Electronic Industry   
Medical Uses
Pharmaceutical Industry   
NA   
Other Uses
NA   
Alloys   
Biological Properties
  
  
Toxicity
Toxic   
Non Toxic   
Present in Human Body
Yes   
Yes   
In Blood
1,620.00 Blood/mg dm-3   
2
0.01 Blood/mg dm-3   
22
In Bone
2,100.00 p.p.m.   
3
0.00 p.p.m.   
34
Physical Properties
Melting Point
63.65 °C   
99+
1,539.00 °C   
24
Boiling Point
774.00 °C   
99+
2,832.00 °C   
35
Appearance
  
  
Physical State
Solid   
Solid   
Color
Silvery Gray   
Silvery White   
Luster
NA   
Lustrous   
Hardness
  
  
Mohs Hardness
0.40   
23
Not Available   
Brinell Hardness
0.36 MPa   
99+
750.00 MPa   
12
Speed of Sound
2,000.00 m/s   
99+
Not Available   
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
K   
Sc   
Isotopes
  
  
Known Isotopes
20   
19
13   
26
Electronegativity
  
  
Pauling Electronegativity
0.82   
99+
1.36   
29
Sanderson Electronegativity
0.45   
31
1.02   
21
Allred Rochow Electronegativity
0.91   
39
1.20   
27
Mulliken-Jaffe Electronegativity
0.73   
23
Not Available   
Allen Electronegativity
0.73   
99+
1.19   
36
Electropositivity
  
  
Pauling Electropositivity
3.18   
3
2.64   
25
Ionization Energies
  
  
1st Energy Level
418.80 kJ/mol   
99+
633.10 kJ/mol   
99+
2nd Energy Level
3,052.00 kJ/mol   
5
1,235.00 kJ/mol   
99+
3rd Energy Level
4,420.00 kJ/mol   
8
2,388.60 kJ/mol   
99+
4th Energy Level
5,877.00 kJ/mol   
9
7,090.60 kJ/mol   
6
5th Energy Level
7,975.00 kJ/mol   
8
8,843.00 kJ/mol   
6
6th Energy Level
9,590.00 kJ/mol   
13
10,679.00 kJ/mol   
7
7th Energy level
11,343.00 kJ/mol   
17
13,310.00 kJ/mol   
8
8th Energy Level
14,944.00 kJ/mol   
13
15,250.00 kJ/mol   
11
9th Energy Level
16,963.70 kJ/mol   
15
17,370.00 kJ/mol   
14
10th Energy Level
48,610.00 kJ/mol   
3
21,726.00 kJ/mol   
13
11th Energy Level
54,490.00 kJ/mol   
4
24,102.00 kJ/mol   
16
12th Energy Level
60,730.00 kJ/mol   
4
66,320.00 kJ/mol   
2
13th Energy Level
68,950.00 kJ/mol   
4
73,010.00 kJ/mol   
2
14th Energy Level
75,900.00 kJ/mol   
5
80,160.00 kJ/mol   
3
15th Energy Level
83,080.00 kJ/mol   
6
89,490.00 kJ/mol   
4
16th Energy Level
93,400.00 kJ/mol   
7
97,400.00 kJ/mol   
5
17th Energy Level
99,710.00 kJ/mol   
8
105,600.00 kJ/mol   
6
18th Energy Level
Not Available   
117,000.00 kJ/mol   
7
19th Energy Level
Not Available   
124,270.00 kJ/mol   
8
Electrochemical Equivalent
1.46 g/amp-hr   
99+
0.56 g/amp-hr   
99+
Electron Work Function
2.30 eV   
99+
3.50 eV   
31
Other Chemical Properties
Chemical Stability, Flammability, Ionization, Solubility   
Corrosion, Flammable, Ionization, Radioactive Isotopes, Solubility   
Atomic Properties
Atomic Number
19   
99+
21   
99+
Electron Configuration
[Ar] 4s1   
[Ar] 3d1 4s2   
Crystal Structure
Body Centered Cubic (BCC)   
Hexagonal Close Packed (HCP)   
Crystal Lattice
BCC-Crystal-Structure-.jpg#100   
HCP-Crystal-Structure-of-Scandium.jpg#100   
Atom
  
  
Number of Protons
19   
99+
21   
99+
Number of Neutrons
20   
99+
24   
99+
Number of Electrons
19   
99+
21   
99+
Radius of an Atom
  
  
Atomic Radius
227.00 pm   
3
162.00 pm   
26
Covalent Radius
203.00 pm   
9
170.00 pm   
25
Van der Waals Radius
275.00 pm   
5
211.00 pm   
25
Atomic Weight
39.10 amu   
99+
44.96 amu   
99+
Atomic Volume
45.46 cm3/mol   
3
15.00 cm3/mol   
34
Adjacent Atomic Numbers
  
  
Previous Element
Aluminium
  
Calcium
  
Next Element
Calcium
  
Titanium
  
Valence Electron Potential
10.40 (-eV)   
99+
58.00 (-eV)   
24
Lattice Constant
532.80 pm   
12
330.90 pm   
99+
Lattice Angles
π/2, π/2, π/2   
π/2, π/2, 2 π/3   
Lattice C/A Ratio
Not Available   
1.59   
7
Mechanical Properties
Density
  
  
Density At Room Temperature
0.86 g/cm3   
99+
2.99 g/cm3   
99+
Density When Liquid (at m.p.)
0.83 g/cm3   
99+
2.80 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Vapor Pressure at 1000 K
Not Available   
0.00 (Pa)   
22
Vapor Pressure at 2000 K
Not Available   
91.30 (Pa)   
3
Elasticity properties
  
  
Shear Modulus
1.30 GPa   
99+
29.10 GPa   
24
Bulk Modulus
3.10 GPa   
99+
56.60 GPa   
21
Young's Modulus
3.53 GPa   
99+
74.40 GPa   
26
Poisson Ratio
Not Available   
0.28   
18
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
0.86   
99+
2.99   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
72.00 nΩ·m   
37
562.00 nΩ·m   
10
Electrical Conductivity
0.14 106/cm Ω   
14
0.02 106/cm Ω   
99+
Electron Affinity
48.40 kJ/mol   
22
18.10 kJ/mol   
33
Thermal Properties
Specific Heat
0.75 J/(kg K)   
6
0.60 J/(kg K)   
8
Molar Heat Capacity
29.60 J/mol·K   
6
25.52 J/mol·K   
37
Thermal Conductivity
102.50 W/m·K   
15
15.80 W/m·K   
99+
Critical Temperature
2,223.00 K   
3
Not Available   
Thermal Expansion
83.30 µm/(m·K)   
3
10.20 µm/(m·K)   
39
Enthalpy
  
  
Enthalpy of Vaporization
77.50 kJ/mol   
99+
314.20 kJ/mol   
28
Enthalpy of Fusion
2.32 kJ/mol   
99+
14.10 kJ/mol   
25
Enthalpy of Atomization
89.50 kJ/mol   
99+
343.00 kJ/mol   
28
Standard Molar Entropy
64.70 J/mol.K   
18
34.60 J/mol.K   
99+
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