14. The nucleus of a hydrogen atom consists of A.1 proton only B.1 proton + 2 neutron C.1 neutron only D.1 electron only
Answer: Option A Solution: Most hydrogen atoms have nuclei that consist of a single proton, but a small fraction (about 0.015 percent) of the hydrogen atoms that occur in Nature have one neutron in addition to the proton in their nuclei.
