Multiple choice general knowledge science & technology Which isotope of hydrogen does not contain any neutron. Deuterium Protium Tritium all isotopes contain atleast 1 neutron Reveal answer Fill a bubble to check yourself B Correct answer Explanation Protium is the hydrogen isotope with no neutrons - it consists of just one proton and one electron (¹H). Deuterium has 1 neutron, and Tritium has 2 neutrons. The option claiming 'all isotopes contain atleast 1 neutron' is false.