Home ยป Which isotope of hydrogen contains only one proton and no neutron in its nucleus? Atomic Structure MCQs Which isotope of hydrogen contains only one proton and no neutron in its nucleus? January 8, 2022 4 Views Q. Which isotope of hydrogen contains only one proton and no neutron in its nucleus? A. Protium B. Deuterium C. Tritium D. None of the above Answer: Protium