A comparison of ionic radii with atomic radii shows that a cation is always smaller than the parent neutral atom.

Name: A comparison of ionic radii with atomic radii shows that a cation is always smaller than the parent neutral atom.
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When an atom loses one or more electrons to become a cation, it loses an entire electron shell and the remaining electrons are pulled closer to the positively charged nucleus, resulting in a decrease in the ionic radius compared to the atomic radius.

A Comparison of Ionic Radii with Atomic Radii Shows That