What is an ion? Explain with examples. (b)What is the nature of charge on (i) a cation, and (ii) an anion? (c)Name the cation and anion present in MgCl2. Also write their symbols.

(a) Ions are charged species. It is formed by loss or gain of an electron by an atom. Example: Na⁺ is cation and Cl^- is anion.

(b)(i) Positive charge for cations (ii) Negative charge for anions

(c) Cation: Magnesium ion, Mg²⁺ Anion: Chloride ions, 2Cl^-