The total mass of reactants equals 5.3 g plus 6.0 g, which is 11.3 g. The total mass of products equals 2.2 g plus 0.9 g plus 8.2 g, which is 11.3 g. Since reactant mass equals product mass, the ...
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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.
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.