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Electron radii problem. I thought that P(-3) would have the smallest radius because it is the same as MG, but the answer key says CA 2+ is the smallest. Can anyone explain this? thanks.5. The following ions are isoelectronic, meaning that they have the same number of electrons. Which of these ions has the smallest atomic radius? (a) Ca+ (b) K (c) Cl 2-

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