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ion (iŽon) an atom or group of atoms having a positive (cation) or negative (anion) electric charge by virtue of having gained or lost an electron; substances forming ions are called electrolytes. adj., ionŽic., adj. dipolar ion
an ion that has both positive and negative regions of charge. hydrogen ion
the positively charged hydrogen atom (H+), which is the positive ion of all acids. See also hydrogen ion concentration. hydroxyl ion
the negatively charged group, OH−, present to excess in alkaline solutions.
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