One
Tritium is 3H, so it has one proton, one electron (in the non-ionized state) and two neutrons.
Tritium [note correct spelling] has one proton and two neutrons per atom.
All hydrogen atoms, regardless of the number of neutrons in its isotope (zero neutrons for protium, one for deuterium, two for tritium), would have only one proton.
2
One - assuming the atom is not an ion.
There are 18 protons in an Aragon atom.
An atom of copper has 29 protons.
An atom of carbon has 6 protons.
An atom of chlorine has 17 protons.
there are 12 protons in an atom of magnesium:-)
There are 26 protons in the atom of iron.
A technetium atom has 43 protons.