Which isotope of hydrogen has no neutron?

Name isotope of hydrogen which has no neutron .

If an isotope of hydrogen has two neutrons in its atom, its atomic number and mass number will respectively be

If an isotope of hydrogen has two neutrons in its atom, its atomic number and mass number will respectively be

Which isotope of hydrogen does not contain any neutron ?

Which isotope of hydrogen does not have neutron ?

Which isotope of hydrogen (a) does not contain neutron, (b) contains equal number of protons and neutrons, ( c) is radioactive.

Which isotope of hydrogen (i) does not contain neutron (ii) is radioactive ?