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Hello. The proton:

Hydrogen-1 (protium): the nucleus includes one proton.
Hydrogen-2 (deuterium): the nucleus includes one proton and one neutron.
Hydrogen-3 (tritium): the nucleus includes one proton and two neutrons. 
Hydrogen-4: one proton and three neutrons.
Hydrogen-5: one proton and four neutrons.
Hydrogen-6: one proton and five neutrons.
Hydrogen-7: one proton and six neutrons.
roseanedurante

Answer:

One Proton is found in all isotopes of hydrogen.

Explanation:

   Proton is a subatomic particle, with a positive electrical charge of + 1e elemental charge and a mass slightly smaller than that of a neutron. Protons and neutrons, having mass of approximately one unit of atomic mass, are collectively referred to as "nucleons", protons are present in the nucleus of an atom. The number of protons in the nucleus is known as atomic number.

 The best known hydrogen isotopes are propium, tritium and deuterium:

  • Deuterium: this isotope has only one neutron and one proton in its nucleus, is heavy and stable. It is used in nuclear fusion processes and when combined with oxygen forms heavy water.
  • Tritium: it is the least abundant hydrogen isotope, its nucleus consists of 1 proton and 2 neutrons and it is a radioactive isotope.
  • Propium: ti is the most commonly occurring isotope among the three and is composed of only one proton in the nucleus. May acquire positive or negative charge when in ionic compounds.