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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 [[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>]].
: The more easily a [[metal]] [[element]] can become a '''metal ion''' the more [[reactivity|reactive]] the [[metal]].