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Why are cations smaller than their parent atoms if the loss of an electron would move them further to the left in a period. Wouldn't this make them larger? Also why are anions larger than their parent atoms if gaining an electron would move them further to the right in a period, which would make them smaller?
Cations are smaller because since they have less electrons than their parent atoms, they are pulled in more closely by the protons (which are unchanged) in the nucleus. The opposite goes for anions where they have increased electron repulsion.
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