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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Statement (iv) is true. Statements (i), (ii) and (iii) are false. Elements contain identical atoms, compounds contain atoms of different elements and nitrogen gas exists as diatomic molecules with two atoms.