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If you need an example, Cl-, Ar, and K+ are all isoelectronic because they all have the same number of electrons as Neon (10 electrons). When an atom has more protons than neutrons, the higher the attraction between electrons and protons, so it will be smaller as the nucleus pulls the electrons in more strongly. The opposite is true for ions with more electrons than protons. So Cl- would have a larger radius than K+.
The more electrons that there are the smaller the radius is. The protons are tight and are pulled to the nucleus. This is opposite for electrons. If there are more electrons, or if there are free electrons then the radius will be bigger.
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