Q. Which of the following are found in nucleus of Deuterium 
Answer: 1 proton & 1 neutron
Notes: Deuterium, an isotope of hydrogen, consists of one proton and one neutron in its nucleus. This makes it distinct from regular hydrogen, which has only one proton and no neutrons. Deuterium is stable and accounts for about 0.0156% of all hydrogen in nature. It is often used in nuclear fusion research and as a tracer in chemical reactions.