![]() ![]() ![]() If a covalent single bond is broken so that one electron of the shared pair remains with each fragment, as in the first example, this bond-breaking is called homolysis. The use of these symbols in bond-breaking and bond-making reactions is illustrated below. In general, two kinds of curved arrows are used in drawing mechanisms: A full head on the arrow indicates the movement or shift of an electron pair:Ī partial head (fishhook) on the arrow indicates the shift of a single electron: It is now common practice to show the movement of electrons with curved arrows, and a sequence of equations depicting the consequences of such electron shifts is termed a mechanism. Since chemical reactions involve the breaking and making of bonds, a consideration of the movement of bonding ( and non-bonding ) valence shell electrons is essential to this understanding. ![]()
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