Question

(a) Write the symbols/formulae of two simple ions and two compound ions (or polyatomic ions).

Answer 1

(a) Example of a simple ion: Iodine atom forms an iodide ion by accepting an electron, I^-. Similarly, magnesium loses two electrons to form a magnesium ion, Mg²⁺.

Example of a compound ion: Carbonate ion, CO₃^2-, is made up of two types of atoms i.e. carbon and oxygen (chemically bonded). Similarly, ammonium ion, NH₄⁺, is made up of two types of atoms i.e. nitrogen and hydrogen (chemically bonded).