Discovered By: Humphry Davy
Discovery year: 1807

The following table showing some properties of Potassium(K):

Table Example
Atomic number 19
Group 1
Period 4
Block s
Electrons 19
Protons 19
Neutrons 20
Atomic weight 39.0983
Oxidation states +1
Ionic charge K^+


Table Example
Electrons per shell K2 L8 M8 N1
Electron configuration 1s^2 2s^2 2p^6 3s^2 3p^6 4s^1
Atomic radius 243 pm
Covalent radius 203 pm
Van der Waals radius 275 pm
Boiling point 759°C
Melting point 63.38°C
Phase Solid
Fusion heat 2.33 kJ.mol^-1
Vaporization heat 76.9 kJ.mol^-1


Table Example
Specific heat 757 J.kg^-1.k^-1
Color Silver
Brinell hardness 0.363 MPa
Density 856 kg.m^-3
Bulk modulus 3.1 Gpa
Liquid density 828 kg.m^-3
Mohs hardness 0.4
Molar volume 4.57*10^-5 m^3.mol^-1
shear modulus 1.3 GPa
Sound speed 2000 m.s^-1


Table Example
Thermal conductivity 100 W.m^-1.k^-1
Electric type Conductor
Magnetic type Paramagnetic
Volume magnetic susceptibility 5.74*10^-6
Resiostivity 7.10^-8 Ohm.m
Electronegativity 0.82
Valence 1
Radioactive No
Neutron cross section 2.1 barn
Electron affinity 48.4 kJ.mol^-1