Arguably, the single key concept in chemistry is the covalent bond. Together with it comes the importance of electronic doublets, either forming part of bonding electron pairs (BEPs) or of non-bonding lone electron pairs (LEPs). Rationalization and prediction of bonding and geometry in molecules are -still these days-dominated by Lewis dot formulas. Drawing of most molecules according to the Lewis formalism leads to easily predicting their atomic connectivity and valence electron distribution, thus evidencing the bond multiplicities and the number of LEPs present on each atom. From there, the well-known VSEPR theory allows us to derive local molecular geometry, granting an easy visualization of the three-dimensional structure of molecules.