Hydrogen has three naturally occurring isotopes:
Protium or 1H has only a single proton in its nucleus (no neutrons) and is by far the most common isotope (~99.9885% of all hydrogen atoms are protium)
Deuterium or 2H has one proton and one neutron in its nucleus and is the second most common isotope (~0.0115% of all hydrogen atoms are deuterium)
Tritium or 3H contains one proton and two neutrons in its nucleus and occurs in very small trace amounts in nature (less than 0.00001%)
4H with 3 neutrons, 5H with 4 neutrons, 6H with 5 neutrons and 7H with 6 neutrons have been produced artificially in the lab but they all have half-life of less than 10-21 seconds.
one
Hydrodgen and Oxygen.
Helium has one more proton than hydrogen
How many neutrons would it have if it had 11 neutrons? 11.
In the Earth atmosphere hydrogen exist only as traces: 0,000055 %.
O+H2o+N (oxygen+Hydrodgen 2oxygens+Nitrogen)
There is no neutrons in Hitrogen.
It has 20 neutrons.
18 neutrons
117 neutrons.
air helium hydrodgen carbon dioxide oxygen butane nitrogen argon
Well, if you want to get technical, EVERY element is different from every other element; each is unique. Hydrogen is the "simplest" element, having only one proton (and very rarely, one neutron) in the nucleus; every other element has two or more protons and usually as many or more neutrons as protons. Perhaps that's the difference you're looking for; hydrogen normally doesn't have ANY neutrons, while every other element always has some.