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: [[Element]]s on the [[Periodic Table]] show 'periodic' patterns in their [[reactivity]].
: [[Element]]s within a [[group]] all engage in similar [[Chemical Reaction|reaction]]s.
: The '''chemical properties''' of a [[chemical]] are determined by how easily [[electron]]s can be gained or lost from the [[Outer Shell|outer shell]], the [[Electrical Charge|charge]] of [[ion]]s they form and the strength of any [[Chemical Bond|chemical bonds]] they already have.