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12. When a chlorine atom forms an ion its radius increases, but when a sodium atom forms an ion its radius decreases. Explain this apparent contradiction

12 When a chlorine atom forms an ion its radius increases but when a sodium atom forms an ion its radius decreases Explain this apparent contradiction class=

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Explanation:

When a chlorine atom forms an ion, it gains electrons, making it negative.  A neutral chlorine will become a chlorine with a -1 charge.  When it gains an electron, the radius increases.

When a sodium atom forms an ion, it loses electrons, making it positive.  A neutral sodium will become a sodium with a +1 charge.  When it loses an electron, the radius decreases.