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An ion of which element has a larger radius than an atom of the same element? (Multiple-choice)

Hello, I'm about to retake a state exam, I was practicing on an older one. This was a question that really stumped me:14 An ion of which element has a larger radius thanan atom of the same element?(1) aluminum (3) magnesium(2) chlorine (4) sodiumNow I know the answer is (2) Chlorine, but why?Thanks so much!! Responses are much appreciated!
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Anya Stehr

Feb 20, 2025

The chlorine ion is the only negative one (it's very electronegative), as the other 3 are metallic and will form positive ions.Since there are more electrons the electron "cloud" will be larger, and the radius of the ion will be larger than the radius of the base element.... Show More
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A
Anya Stehr

Feb 20, 2025

Chlorine is the only element of those four with a negatively charged ion.. negatively charged ions are always bigger than their respective elements because the outermost electrons experience the same effective nuclear charge (positive charge from the nucleus), but since there are more of them, they are not held in as tightly.... Show More
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