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: [[Atom]]s in the same [[Group (Chemistry)|group]] have similar [[Chemical Property|chemical properties]] because they all have the same number of [[electron]]s in their [[Outer Shell]].
===References===
====AQA====
:[https://www.amazon.co.uk/gp/product/0198359381/ref=as_li_tl?ie=UTF8&camp=1634&creative=6738&creativeASIN=0198359381&linkCode=as2&tag=nrjc-21&linkId=47c8d1ae58d8b3a5e2094cd447154558 ''Shells, electrons, pages 13, 18-19, GCSE Chemistry; Third Edition, Oxford University Press, AQA '']