Potassium
Elemental State K
Electron Configuration 1s22s22p63s23p64s1
First Ionization Potential 4.341 eV
Electron Affinity 0.501 eV
Z* 3.495 (Clementi-Raimondi)
Pauling Electronegativity 0.82
Covalent Radius 1.96 Å
Metallic Radius 2.35 Å
Ionic Radius 1.51 Å K+ coordination number = 4

1.52 Å K+ coordination number = 6

1.60 Å K+ coordination number = 7

1.65 Å K+ coordination number = 8

van der Waal's Radius 2.75 Å
Melting Point 63.28 oC
Boiling Point 759 oC
Density 0.862 g/cm3
Other Properties