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: [[Group 7]] [[Element]]s all form -1 [[ion]]s; F<sup>-1</sup>, Cl<sup>-1</sup>
: Some [[compound]]s can form [[Negative Ion|negative ions]]; [[Carbonate]] forms -2 [[ion]]s CaCOCO<Sub>3</sub><sup>-2<sup>, [[Sulphate]] forms -2 [[ion]]s SO<Sub>4</sub><sup>-2<sup>, [[Nitrate]] forms -1 [[ion]]s NO<Sub>3</sub><sup>-1<sup>
===Examples===
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