Option (iii) correctly represents the chloride ion Cl-. A neutral chlorine atom has 17 electrons with arrangement 2, 8, 7. Gaining one electron forms Cl- with 18 electrons distributed as 2, 8, 8 in three shells.
Which of the following, in Fig. 9.18, correctly represents Cl- ion (Atomic number of chlorine = 17).
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Option (iii) is the correct representation of the Cl- ion. A chlorine atom possesses an atomic number of 17, meaning it normally contains seventeen electrons with the shell configuration 2, 8, 7. Upon forming a chloride anion Cl-, it gains one electron to attain a stable octet, totaling eighteen electrons. Diagram (iii) accurately displays this electronic configuration containing 2 electrons, 8 electrons and 8 electrons.
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