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[[Image:Ion.png|thumb|right|An electrostatic potential map of the nitrate ion (NO3−). Areas coloured red are lower in energy than areas coloured yellow]]
An atom that possesses a number of electrons that is greater or lower than the number of protons, yielding a net electric charge.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref>
An atom that possesses a number of electrons that is greater or lower than the number of protons, yielding a net electric charge.<ref>Wile, Dr. Jay L. ''Exploring Creation With Chemistry''. Apologia Educational Ministries, Inc. 1998</ref>