Chemical Formulas of Ions

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Sulfite

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SO3^2-

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Chlorate

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ClO3^-

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Nitrate

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NO3^-

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Hydrogen Sulfite

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HSO3^-

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Hydronium

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H3O^+

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Definition of an Ion

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An atom or molecule that has a net electrical charge due to the loss or gain of one or more electrons.

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Cation

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A positively charged ion, formed by the loss of electrons.

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Anion

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A negatively charged ion, formed by the gain of electrons.

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Polyatomic Ion

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An ion composed of two or more atoms bonded together, that carries a charge.

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Example of a Cation

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Na^+ (Sodium ion)