The resulting chemical formulae are CaBr2, Al2(CO3)3, K2SO4 and NH4Cl. In each ionic compound, the valency numbers are criss-crossed so that positive and negative charges balance out to maintain overall electrical neutrality.
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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.