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Potassium Properties
Potassium


Physical
0
Melting Point
63.65 °C 77
Boiling Point
774.00 °C 72
Hardness
0
Mohs Hardness
0.40 23
Brinell Hardness
0.36 MPa 54
Vickers Hardness
Not Available 0
Optical Properties
0
Refractive Index
Not Available 0
Reflectivity
Not Available 0
Speed of Sound
2,000.00 m/s 45
Allotropes
No 0
α Allotropes
Not Available 0
β Allotropes
Not Available 0
γ Allotropes
Not Available 0
Chemical
0
Chemical Formula
K 0
Isotopes
0
Known Isotopes
20 19
Electronegativity
0
Pauling Electronegativity
0.82 51
Sanderson Electronegativity
0.45 31
Allred Rochow Electronegativity
0.91 39
Mulliken-Jaffe Electronegativity
0.73 23
Allen Electronegativity
0.73 45
Electropositivity
0
Pauling Electropositivity
3.18 3
Ionization Energies
0
1st Energy Level
418.80 kJ/mol 87
2nd Energy Level
3,052.00 kJ/mol 5
3rd Energy Level
4,420.00 kJ/mol 8
Electrochemical Equivalent
1.46 g/amp-hr 47
Electron Work Function
2.30 eV 44
Other Chemical Properties
Chemical Stability, Flammability, Ionization, Solubility 0
Mechanical
0
Density
0
Density At Room Temperature
0.86 g/cm3 83
Density When Liquid (at m.p.)
0.83 g/cm3 59
Vapor Pressure
0
Vapor Pressure at 1000 K
Not Available 0
Vapor Pressure at 2000 K
Not Available 0
Tensile Strength
Not Available 0
Viscosity
Not Available 0
Elasticity properties
0
Shear Modulus
1.30 GPa 52
Bulk Modulus
3.10 GPa 48
Young's Modulus
3.53 GPa 56
Poisson Ratio
Not Available 0
Other Mechanical Properties
NA 0
Periodic Table
0
Symbol
K 0
Group Number
1 17
Period Number
4 4
Block
s block 0
Element Family
Alkali 0
Atomic
0
Atomic Number
19 87
Atomic Weight
39.10 amu 81
Atomic Volume
45.46 cm3/mol 3
Electron Configuration
[Ar] 4s1 0
Valence Electron Potential
10.40 (-eV) 63
Atom
0
Number of Protons
19 86
Number of Neutrons
20 64
Number of Electrons
19 86
Crystal Structure
Body Centered Cubic (BCC) 0
Crystal Lattice
BCC-Crystal-Structure-.jpg#100 0
Radius of an Atom
0
Atomic Radius
227.00 pm 3
Covalent Radius
203.00 pm 9
Van der Waals Radius
275.00 pm 5
Lattice Constant
532.80 pm 12
Lattice Angles
π/2, π/2, π/2 0
Lattice C/A Ratio
Not Available 0
Adjacent Atomic Numbers
0
Next Element
12 0
Previous Element
17 0
Magnetic
0
Electrical Properties
0
Resistivity
72.00 nΩ·m 37
Electrical Conductivity
0.14 106/cm Ω 14
Electron Affinity
48.40 kJ/mol 22
Electrical Property
Conductor 0
Magnetic Characteristics
0
Specific Gravity
0.86 69
Magnetic Ordering
Paramagnetic 0
Permeability
Not Available 0
Susceptibility
Not Available 0
Thermal
0
Specific Heat
0.75 J/(kg K) 6
Thermal Conductivity
102.50 W/m·K 15
Critical Temperature
2,223.00 K 3
Molar Heat Capacity
29.60 J/mol·K 6
Thermal Expansion
83.30 µm/(m·K) 3
Standard Molar Entropy
64.70 J/mol.K 18
Enthalpy
0
Enthalpy of Vaporization
77.50 kJ/mol 55
Enthalpy of Fusion
2.32 kJ/mol 60
Enthalpy of Atomization
89.50 kJ/mol 58
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