Answer:
<h2>Ionic bond</h2>
<em>Meani</em><em>ng</em><em> </em><em>:</em><em>-</em><em> </em><em>When</em><em> there is a strong electrostatic force of attraction between a cation and an anion (two oppositely charged ions) of elements is called the ionic bond. This bond is formed between a metal and a non-metal.</em>
Involves :-<em>Transfer and accepting of electrons from the valence shell.</em>
Existence :-<em> </em><em>They also exist in the solid state only.</em>
<em>Exampl</em><em>es</em><em> </em><em>:</em><em>-</em><em> </em><em>NaCl</em><em>, BeO, LiF, etc</em>
<h2>Covalent bond</h2>
Meaning :- <em>When there is a strong electrostatic force of attractions between two positively charged nuclei and the shared pair of electrons is called the covalent bond.</em>
Involves :- <em>Sharing of electrons in the valence shell.</em>
Existence:- <em>Exist as solids, liquids and gases</em>.
Examples :- <em>Diamond, carbon, silica, hydrogen gas, water, nitrogen gas, etc.</em>