Biology / Bio 0127 · Atom · ~20 seconds
Ions
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An ion is an atom that has gained or lost one or more electrons, giving it a net electric charge.
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Sodium loses its one outer electron to become a positively charged ion; chlorine gains an electron to become a negatively charged ion.
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An ion's charge comes from an imbalance between protons and electrons, never from a change in its number of protons.