What is the Mass number of tritium? Share with your friends Share 0 Dad's PrincessđŸ˜˜ answered this 3..? 0 View Full Answer Ameena answered this Three 0 Sandipan answered this Mass number of tritium is 3. Atomic Number/No.of Protons/No.of electrons-1 No.of Neutrons-2 Hope it helps. 2 Dad's PrincessđŸ˜˜ answered this The mass number is 3 0 Sivam answered this This is the mass number of tritium 0 Aakash Mishra answered this The mass number of tritium is three 0