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Step 1: Recall the structure of the chlorite ion
The chlorite ion is a polyatomic ion with the chemical formula ClO$_2^{-}$.
It consists of one chlorine atom and two oxygen atoms.
Step 2: Write the chemical formula
To write the chemical formula, list the symbols for the atoms in the ion, including subscripts if necessary. In this case, there is one chlorine atom (Cl) and two oxygen atoms (O). However, since there are two oxygen atoms, a subscript of 2 is needed. However, since the overall charge of the ion is - 1, we need to add a negative charge to the right of the formula to balance the charge.
Final Answer
The chemical formula for the chlorite ion is ClO$_2^{-}$.
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