Answer: The region of the atom where proton and neutrons are located is nucleus.
Step-by-step explanation:
An atom is the smallest unit of the matter and contains neutrons, protons and electrons as subatomic particles.
Neutrons which are neutral and protons which are positively charged are present in the nucleus.
The electrons which are negatively charged revolve around the nucleus in orbitals of fixed energy called as shells.
Thus the region of the atom where proton and neutrons are located is nucleus.