Which ion has a 1- charge?

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Multiple Choice

Which ion has a 1- charge?

Explanation:
Understanding how to read the overall charge of an ion from its formula is key. The net charge comes from the balance of electrons and protons in the ion; for polyatomic ions, the charge written after the formula is the total. The nitrate ion, NO3−, carries a single negative charge overall. Sulfate, SO4^2−, and carbonate, CO3^2−, both carry a -2 charge, while ammonium, NH4+, carries a +1 charge. So the ion with a 1− charge is nitrate.

Understanding how to read the overall charge of an ion from its formula is key. The net charge comes from the balance of electrons and protons in the ion; for polyatomic ions, the charge written after the formula is the total. The nitrate ion, NO3−, carries a single negative charge overall. Sulfate, SO4^2−, and carbonate, CO3^2−, both carry a -2 charge, while ammonium, NH4+, carries a +1 charge. So the ion with a 1− charge is nitrate.

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