Define an anion and cation. Give two examples of compounds and label their cation and anion.

An ion is a charged particle formed when an atom loses/gains electron(s). Eg: $N{a}^{+},C{l}^{-}$ are the ions formed by the sodium and chlorine atoms respectively.
[1 Mark]

Cation: It is a positively charged ion. Eg: $N{a}^{+}$
[0.5 Marks]
Anion: It is a negatively charged ion. Eg: $C{l}^{-}$,
[0.5 Marks]

Compounds and their ions :
1. $MgC{l}_2$: Cation: $M{g}^{2+}$ and anion: $C{l}^{-}$
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2. $CaC{O}_3$: Cation: $C{a}^{2+}$ and anion: $C{O}_3^{2-}$
[0.5 Marks]