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==Key Stage 4=====Meaning===An '''ionic compound''' is a [[molecule]] formed from 2 or more [[element]]s which have transferred [[electron]]s to become [[ion]]s. ===About Ionic Compounds===: '''Ionic compounds''' form when [[atom]]s lose one or more [[electron]]s to become a [[Positive Ion|positive ion]]s and other [[atom]]s gain [[electron]]s to become [[Negative Ion|negative ions]]. The [[Electrostatic Force|electrostatic force]] of [[attraction]] between these [[ion]]s is a strong [[Chemical Bond|chemical bond]].: [[Metal]] [[element]]s form [[Positive Ion|positive ions]] because it is easier for them lose [[electron]]s than gain [[electron]]s to get a full [[Outer Shell|outer shell]]. [[Metal]]s are on the left hand side of the [[Periodic Table]] and usually have either 1, 2 , 3 or 3 4 [[electron]]s in the [[Outer Shell]].: [[Group 1]] [[Element]]s all form +1 [[ion]]s; Li<sup>+1</sup>, Na<sup>+1</sup>, K<sup>+1</sup>: [[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 [[Fe]](II) which is [[Fe]]<sup>+2</sup> or [[Fe]](III) is [[Fe]]<sup>+3</sup>Manganese can form [[Mn]](II) which is [[Mn]]<sup>+2</sup> or [[Mn]](IV) which is [[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]].
: [[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>
: [[Group 7]] [[Element]]s all form -1 [[ion]]s; F<sup>-1</sup>, Cl<sup>-1</sup>
===Examples===
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