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Structure of Atom
Number of valence electrons in Cl– ion are:
Valency is determined by subtracting valence electrons from the octet. The valency of an atom is the same as that of the number of valence electrons in that atom for the atoms which have valence electrons less than or equal to 4.
The atomic number of the chlorine atom is 17. Its electronic configuration will be (2,8,7). It contains 7 valence electrons and needs 1 electron to complete its octet. The chlorine will take one electron to form chloride anion . Thus the chloride ion will have 18 electrons (2, 8, 8).
Hence, the correct answer is (b) 8.
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