![]() ![]() A common notation is used to classify various molecules and the shapes they should adopt: AX nE m, where A = central atom, X = atoms connected to A by bonds, E = lone pairs on A. ![]() The shape of the molecule can differ from the basic arrangement of electron density regions, depending on how many "corners" of the arrangement are taken up by lone pairs. The basic arrangements of the electron pairs depends on the number of regions of electron density (bonds + lone pairs), as follows: Regions of
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