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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]]sNumerals; [[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]].