Question

What are ionic compounds? Give example.

Answer 1

Ionic compounds are the compounds that are formed by the gain or loss of electrons. In other words these are formed by the attraction of cations and anions.
Ex :
$2\mathrm{Na}+{\mathrm{Cl}}_2\to 2{\mathrm{Na}}^{+}+2{\mathrm{Cl}}^{-}\to 2\mathrm{NaCl}$

Sodium is a group 1 metal, thus forms a +1 charged cation. Chlorine is a non-metal, and has the ability to form a -1 charged anion. These two together form sodium chloride.