Question

# (a) 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.

Solution

## Answer : (a) An electrically-charged atom (or group of atoms) is called an ion. it is formed by the loss or gain of an electron by an atom. Ions are of two types: cations and anions. For example, A sodium ion (Na+ ) is formed when a sodium atom loses one electron. A sodium ion is a cation. A chloride ion (Cl− ) is formed when a chlorine atom gains one electron. A chloride ion is an anion. (b) (i) The charge on a cation is positive.         (ii) The charge on an anion is negative. (c) The cation present in MgCl2  is a magnesium ion that is represented as Mg2+  and the anion present is a chloride ion that is represented by Cl−.

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