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: [[Group 2]] [[Element]]s all form +2 [[ion]]s; Be<sup>+2</sup>, Mg<sup>+2</sup>, Ca<sup>+2</sup>
: [[Group 3]] [[Element]]s all form +3 [[ion]]s; Al<sup>+3</sup>
: [[Transition Metal]] [[Element]]s can form different [[ion]]s which are shown by [[Roman Numeral]]s;Iron can form [[Fe]](II) which is [[Fe]]<sup>+2</sup> or [[Fe]](III) is [[Fe]]<sup>+3</sup>,
Manganese can form [[Mn]](II) which is [[Mn]]<sup>+2</sup> or [[Mn]](IV) which is [[Mn]]<sup>+4</sup>
: [[Group 6]] [[Element]]s all form -2 [[ion]]s; O<sup>-2</sup>, S<sup>-2</sup>
: [[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 CaCO<Sub>3</sub><sup>-2<sup>
===Examples===
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