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Valence Electrons

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Question

what is the no. of balance electron in chlorine ion ??

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Solution

Your question has some logical error, it should be 'valence electrons'.
Chlorine has 17 electrons, In chlorine number of valence electron is 7.
When it gains one more electron than it forms chloride ion (Cl^-), so the number of valence electrons in chloride ion = 8

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