[4] Pauling first stated his "postulate of the essential electroneutrality of atoms" in his 1948 Liversidge lecture (in a broad-ranging paper that also included his ideas on the calculation of oxidation states in molecules): A slightly revised version was published in 1970: Pauling said in his Liversidge lecture in 1948 that he had been led to the principle by a consideration of ionic bonding.
This would be represented by one bond of around 50% covalent character resonating between the six positions and the overall effect would be to reduce the charge on Cs to about + 0.5 and fluoride to -0.5.
Additionally as the most electronegative atom should carry the negative charge, then the triple bonded structure on the left is predicted to be the major contributor.
[7] The hexammine cobalt(III) complex [Co(NH3)6]3+ would have all of charge on the central Co atom if the bonding to the ammonia molecules were electrostatic.
Using the electroneutrality principle the assumption is made that the Co-N bond will have 50% ionic character thus resulting in a zero charge on the cobalt atom.
The "adjacent charge rule" was another principle of Pauling's for determining whether a resonance structure would make a significant contribution.