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: [[Transition Metal]] [[Element]]s can form different [[ion]]s which are shown by [[Roman Numeral]]s;
[[Iron ]] can form [[Iron|Fe]](II) ]] which is [[Iron|Fe]]<sup>+2</sup> ]] or [[Iron|Fe]](III) ]] is [[Iron|Fe]]<sup>+3</sup>]],[[Manganese ]] can form [[Manganese|Mn]](II) ]] which is [[Manganese|Mn]]<sup>+2</sup> ]] or [[Manganese|Mn]](IV) ]] which is [[Manganese|Mn]]<sup>+4</sup>]]
: [[Group 5]] [[Element]]s all form -3 [[ion]]s; N<sup>-3</sup>, P<sup>-3</sup>
: [[Group 6]] [[Element]]s all form -2 [[ion]]s; O<sup>-2</sup>, S<sup>-2</sup>