Question

number of valence electrons in Cl-ion are? why

Answer 1

Number of electrons in a chloride ion is 17. Hence, it needs one more electron to complete its octet. Its valence electrons are the number of electrons present in its outermost shell, i.e., 7. Chloride ion, ie Cl- has total 18 electrons

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Answer 2

There are 7 valence electron in Chlorine ions because the last shell of a chlorine has 7 electrons..