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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>]],