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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 Numerals; [[Roman NumeralIron]]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>]]
: [[Non-metal]] [[element]]s form [[Negative Ion|negative ions]] because it is easier for them to gain [[electron]]s than lose [[electron]]s to get a full [[Outer Shell|outer shell]]. [[Non-metal]]s are on the right hand side of the [[Periodic Table]] and usually have 4, 5, 6, 7 or 8 [[electron]]s in their [[Outer Shell|outer shell]].