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Promethium vs Potassium

Promethium
Potassium
Potassium vs Promethium


Periodic Table
Symbol
Pm   
K   
Group Number
Not Available   
1   
17
Period Number
6   
4   
Block
f block   
s block   
Element Family
Lanthanide   
Alkali   
CAS Number
7440122   
99+
7440097   
99+
Space Group Name
Not Available   
Im_ 3m   
Space Group Number
Not Available   
229.00   
1
Facts
Interesting Facts
  • Promethium metal found in Pitchblende.
  • Promethium metal is highly radioactive metal.
  
  • In the list of most abundant element Potassium is ranked 7th.
  • Potassium can easily be sliced (chopped) down using knife.
  
Sources
Found in Minerals, Mining   
Found in Minerals, Mining   
History
  
  
Who Discovered
Chien Shiung Wu, Emilio Segrè, Hans Bethe   
Humphry Davy   
Discovery
In 1942   
In 1807   
Abundance
  
  
Abundance In Universe
Not Available   
3 * 10-4 %   
9
Abundance In Sun
~-9999 %   
~0.0004 %   
9
Abundance In Meteorites
Not Available   
0.07 %   
9
Abundance In Earth's Crust
Not Available   
1.50 %   
6
Abundance In Oceans
Not Available   
0.04 %   
3
Abundance In Humans
Not Available   
0.20 %   
2
Uses
Uses & Benefits
  • It is used for research purpose. Very small amount of this metal is used in atomic batteries.
  • Its radioactive decay is used for a phosphor to give off light. The light emitted is converted into electricity.
  
  • 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
NA   
Ammunition Industry, Chemical Industry   
Medical Uses
NA   
Pharmaceutical Industry   
Other Uses
NA   
NA   
Biological Properties
  
  
Toxicity
Non Toxic   
Toxic   
Present in Human Body
No   
Yes   
In Blood
0.00 Blood/mg dm-3   
37
1,620.00 Blood/mg dm-3   
2
In Bone
Not Available   
2,100.00 p.p.m.   
3
Physical Properties
Melting Point
1,042.00 °C   
99+
63.65 °C   
99+
Boiling Point
3,000.00 °C   
31
774.00 °C   
99+
Appearance
  
  
Physical State
Solid   
Solid   
Color
Unknown   
Silvery Gray   
Luster
Metallic   
NA   
Hardness
  
  
Mohs Hardness
Not Available   
0.40   
23
Brinell Hardness
Not Available   
0.36 MPa   
99+
Speed of Sound
Not Available   
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
Pm   
K   
Isotopes
  
  
Known Isotopes
27   
12
20   
19
Electronegativity
  
  
Pauling Electronegativity
Not Available   
0.82   
99+
Sanderson Electronegativity
Not Available   
0.45   
31
Allred Rochow Electronegativity
1.07   
32
0.91   
39
Mulliken-Jaffe Electronegativity
Not Available   
0.73   
23
Allen Electronegativity
Not Available   
0.73   
99+
Electropositivity
  
  
Pauling Electropositivity
Not Available   
3.18   
3
Ionization Energies
  
  
1st Energy Level
540.00 kJ/mol   
99+
418.80 kJ/mol   
99+
2nd Energy Level
1,050.00 kJ/mol   
99+
3,052.00 kJ/mol   
5
3rd Energy Level
2,150.00 kJ/mol   
99+
4,420.00 kJ/mol   
8
4th Energy Level
3,970.00 kJ/mol   
38
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
1.80 g/amp-hr   
36
1.46 g/amp-hr   
99+
Electron Work Function
Not Available   
2.30 eV   
99+
Other Chemical Properties
Ionization, Radioactive Isotopes, Solubility   
Chemical Stability, Flammability, Ionization, Solubility   
Atomic Properties
Atomic Number
61   
99+
19   
99+
Electron Configuration
[Xe] 4f5 6s2   
[Ar] 4s1   
Crystal Structure
Double Hexagonal Close Packed (DHCP)   
Body Centered Cubic (BCC)   
Crystal Lattice
DHCP-Crystal-Structure-of-Promethium.jpg#100   
BCC-Crystal-Structure-.jpg#100   
Atom
  
  
Number of Protons
61   
99+
19   
99+
Number of Neutrons
84   
40
20   
99+
Number of Electrons
61   
99+
19   
99+
Radius of an Atom
  
  
Atomic Radius
183.00 pm   
10
227.00 pm   
3
Covalent Radius
199.00 pm   
12
203.00 pm   
9
Van der Waals Radius
236.00 pm   
16
275.00 pm   
5
Atomic Weight
145.00 amu   
99+
39.10 amu   
99+
Atomic Volume
22.39 cm3/mol   
12
45.46 cm3/mol   
3
Adjacent Atomic Numbers
  
  
Previous Element
Neodymium
  
Aluminium
  
Next Element
Samarium
  
Calcium
  
Valence Electron Potential
44.10 (-eV)   
39
10.40 (-eV)   
99+
Lattice Constant
Not Available   
532.80 pm   
12
Lattice Angles
Unknown   
π/2, π/2, π/2   
Lattice C/A Ratio
Not Available   
Not Available   
Mechanical Properties
Density
  
  
Density At Room Temperature
7.26 g/cm3   
99+
0.86 g/cm3   
99+
Density When Liquid (at m.p.)
Not Available   
0.83 g/cm3   
99+
Tensile Strength
Not Available   
Not Available   
Viscosity
Not Available   
Not Available   
Vapor Pressure
  
  
Elasticity properties
  
  
Shear Modulus
18.00 GPa   
36
1.30 GPa   
99+
Bulk Modulus
33.00 GPa   
36
3.10 GPa   
99+
Young's Modulus
46.00 GPa   
38
3.53 GPa   
99+
Poisson Ratio
0.28   
17
Not Available   
Other Mechanical Properties
NA   
NA   
Magnetic Properties
Magnetic Characteristics
  
  
Specific Gravity
7.26   
99+
0.86   
99+
Magnetic Ordering
Paramagnetic   
Paramagnetic   
Electrical Properties
  
  
Electrical Property
Conductor   
Conductor   
Resistivity
0.75 nΩ·m   
99+
72.00 nΩ·m   
37
Electrical Conductivity
Not Available   
0.14 106/cm Ω   
14
Electron Affinity
50.00 kJ/mol   
21
48.40 kJ/mol   
22
Thermal Properties
Specific Heat
0.18 J/(kg K)   
33
0.75 J/(kg K)   
6
Molar Heat Capacity
Not Available   
29.60 J/mol·K   
6
Thermal Conductivity
17.90 W/m·K   
99+
102.50 W/m·K   
15
Critical Temperature
Not Available   
2,223.00 K   
3
Thermal Expansion
9.00 µm/(m·K)   
99+
83.30 µm/(m·K)   
3
Enthalpy
  
  
Enthalpy of Vaporization
Not Available   
77.50 kJ/mol   
99+
Enthalpy of Fusion
7.50 kJ/mol   
99+
2.32 kJ/mol   
99+
Enthalpy of Atomization
310.00 kJ/mol   
34
89.50 kJ/mol   
99+
Standard Molar Entropy
Not Available   
64.70 J/mol.K   
18
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