A slightly more careful thinking would have a chemist state that there are two possible alternate chains and that the two should resonate (Figure top and center). Uneven resonance (possibly brought about by crystal surroundings) about covalent and 3c-4e bonds was already envisaged by Hach and Rundle to explain the odd bonding alternation in polyiodides. Returning to I∞, the resonance between alternated 2c-2e bonds and "no bonds" would indeed be a 2c-1e EDMB (Figure bottom). As a concept, EDMBs, especially in the finite case, are not new, nor poorly understood, having led to a Nobel Prize. There is nothing special about the 2c-1e EDMB extended to infinite, except for the considerable cultural shock of having to admit EDMB as a "natural" type of bond in such chains, even for (valence) electron-rich elements, such as pnictogens, chalcogens, and halogens. In this sense, beyond an initial sense of scandal, the proposition and formal demonstration of EDMBs for an infinite linear iodine chain, advanced by Manjón and coworkers, stands out as a Columbus' egg. We will show below how it is possible to predict stability, bending, and bond alternation in linear (i.e. not branched) chain polyiodides of all main series (In -, In 2-, In 3-) with a simple pen-and-paper approach based on the following broad concepts: i) Lewis dot formulas; ii) octet rule; iii) VSEPR theory; and iv) the single covalent 2c-2e bond, the 3c-4e bond (ERMB, with the notion they cannot extend beyond 3 atoms) and the extended 2c-1e bond (EDMB, with the notion they are the standard bond for I∞, the finite charge being irrelevant in the infinite chain limit). The exercise we are going to make for polyiodides is untrivial with standard Lewis formulas using only electronic doublets (BEPs and LEPs), much like it is not possible to achieve a satisfying picture of molecules like B2H6 without considering the 3c-2e EDMB (the finite version of the extended or infinite 2c-1e EDMB of I∞). To that end, we will refer to the I∞ limit as the situation in which each I atom is surrounded by 3 LEPs and is involved in an infinite 2c-1e EDMB (Figure bottom, cf. ref. 21).