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In principle, only by comparing the chemical formula for the compound with the formulas of ions known to be polyatomic to determine whether the sequence of letters and subscript numbers (if any) in any part of the chemical formula corresponds to the sequence of letters and subscript numbers in the formula of a know polyatomic ion.

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11y ago
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12y ago

if the molecule is an ion, it has a full outer shell of 8 electrons. If not two molecules have to combine to make an ion.

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Q: How do you know if something is polyatomic?
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