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.
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The correct option is (iii). Two Fe3+ ions provide a total positive charge of 6+ and three O2- ions provide a total negative charge of 6-, making the combination neutral and fully balanced.