Define octet rule. Write its significance and limitations.

Explanation

Atoms combine either by tranfer of valence electrons from one atom to another (gaining or losing) or by sharing of valence electrons in order to complete their octets in their valence shell. This is called the octet rule.
Significance : The octet rule helps to explain as to why different atoms combine with each other to form ionic or covalent compounds.
Limitations of octet rule.