anion

An ion is an atom or molecule with a net electric charge due to an unequal number of protons (positive particles) and electrons (negative particles). Anions have a negative charge because they have more electrons than protons.

Citation: 
Adapted from "anion." American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2011 by Houghton Mifflin Harcourt Publishing Company.
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