Question

By gaining one electron a chlorine atom becomes a chloride ion. Why is chloride ion more stable
than chlorine atom​

Answer 1

Since each chlorine atom gained an electron, they each have 17 protons and 18 electrons. This makes each chloride a negative ion with a charge of −1. Oppositely charged ions attract each other, forming an ionic bond. The bonded ions are more stable than the individual atoms were.

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Answer 2

Answer:Every atom needs 8 electrons in its outermost shell except for a few like hydrogen, helium etc. Here, chlorine needs one more electron to complete its last shell and become stable.  When this happens chlorine will become a chloride ion because now it has some charge .

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