In comparison to their neutral parent atom, anions are bigger and cations are smaller.
<h3>Why are anions of the same element larger than their neutral counterparts?</h3>
They are forced to spread out more due to electron-electron attraction. They can get closer to each other because there is less electron-electron repulsion.
Because cations contain fewer electrons than their parent atoms while maintaining the same nuclear charge, they are always smaller than those atoms. The leftover electrons are therefore held by the protons in the nucleus more tightly, and as a result, their radii are less than those of the parent atoms. With anion, this is the exact opposite.
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