Answer :

Atom of hydrogen-2 has one proton, one neutron, and one electron.  Particles that identify the atom as hydrogen are :electron and proton.

There are three isotopes of hydrogen namely: protium (¹H), deuterium (²H) and tritium (³H).

Protium is the most abundant isotope, consisting of one electron, one proton and zero neutron.

Deuterium or hydrogen-2, consists of one electron, one proton and one neutron.  (D, or(²H) is the symbol for deuterium and is called heavy hydrogen.

Tritium is an isotope of hydrogen that consists of one proton, two neutrons, and one electron.  (³H) is the symbol for tritium and the atomic number of tritium is 1 and the atomic mass of tritium 3.

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