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Just as a brick falls to earth in response to the attractive force of gravity, or a compass needle moves under magnetic force, so atoms and electrons respond to the forces on them by undergoing chemical reaction. By far the most important requirement for an understanding of chemical reaction and its results is an understanding of the forces exerted on electrons before and after reaction and the resulting forces exerted on atoms. The latter forces are called chemical bonds; they are the principal object of most of the study of chemistry
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