Explain the formation of ammonia molecules.
Ammonia i.e. NH3 is made up of one nitrogen molecule and three hydrogen molecules.
Electronic configuration of nitrogen (7) - 2,5.
Electronic configuration of hydrogen(1) - 1
Nitrogen needs three more electrons to complete its octet. So, the 3 hydrogen atoms share 1 electrons each with the nitrogen by forming covalent bonds and thus NH3 is formed.