REYESJAIRAH25IN REYESJAIRAH25IN Science Answered 1.HydrogenIsotope-H-1number of proton-number of neutron-0mass number-12.HydrogenIsotope-H-2number of proton-1number of neutron-mass number-23.HydrogenIsotope-H-3number of proton-number of neutron-mass number-3