Text: An ion is, generally, an electrically charged atom or molecule. Negatively charged ions are known as anions (which are attracted to anodes) and positively charged ions are called cations (which are attracted to cathodes). (continued at Wikipedia) Positive Charge: having a deficiency of electrons. Encyclopedia article (Electric charge) Electric charge, Q, is a measurement of the elementary charge held by an object. The unit of measurement is the coulomb, which represents 6.24 x 1018 elementary charges. Q is a fundamental conserved property of matter. (continued at Wikipedia)

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