Number of electron in CL ion will be
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2: The Formation of a Chlorine Ion. On the left, the chlorine atom has 17 electrons. On the right, the chloride ion has 18 electrons and has a 1− charge. With two oppositely charged ions, there is an electrostatic attraction between them because opposite charges attract.
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The electronic configuration of chlorine is 2, 8, 7 (Atomic number-17).Cl is formed from adding one electron so the new electronic configuration is 2, 8, 8. So the valence electrons is 8.
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