(a) What is the difference between monatomic ions and polyatomic ions?
(b) Give two examples of trivalent metal ions.

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Solution

(a) Monatomic ions are composed of a single atom whereas polyatomic ions are composed of two or more atoms per ion.
Examples: Monoatomic Ion - Na⁺,Mg⁺²,Cl^- ,O^2-etc.
Polyatomic Ion - Ammonium ion (NH₄⁺), hydroxide
ion (OH^– )etc.
(b) Al³⁺ and Fe³⁺

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