Superpair

chemistry

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chemical bondFigure 9: Double bonds. The geometric arrangement of atoms linked by two shared pairs of electrons in a double bond (top) can be simulated by treating the double bond as the result of the sharing of a single superpair of electrons (bottom).Encyclopædia Britannica, Inc.

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multiple bonding

…treated as a single “superpair” of electrons. This rule can be justified by considering the geometric shapes that stem from two atoms sharing two or more pairs of electrons (Figure 9). Thus, the sulfate ion, SO42−, for which a Lewis structure is