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Today, the Brønsted-Lowry theory of acids is the most widely used. However, some chemists prefer an even broader definition. This broader definition of acids states that all acids can be defined as electron pair acceptors. This means that an acid will readily accept electrons from othet atoms or molecules. When this happens, the acid and the donor molecule form a new molecule by sharing the electron pair. This definition includes brønsted Lowry acids. It also includes acids that do not contain hydrogen atoms and thus cannot be hydrogen ion donors.