Hello candidate,

Nuclear chemistry is a branch of chemistry which deals with the nuclear and sub atomic level of particles taking part in reaction and other chemical phenomena including atoms and molecules. Nuclear Chemistry is used to understand the mechanism between inter atomic reactions, hydrogen spectrum, and chemical bonding analysis.

On the other hand, environment chemistry deals with the presence of chemical elements in the nature and their effects on various life forms and other physical elements which includes phenomenon like acid rain.

Hope it was informational!!