Why there is no neutron in a Hydrogen atom?

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Hydrogen exists as three different isotopes. H-1, H-2, and H-3.  H-1 is hydrogen with a proton in the nucleus and exists in nature as H2. This is the most common form of hydrogen.

H-2, also known as deuterium, has one proton and one neutron in its nucleus.

H-3, also known as tritium, has one proton and two neutrons in its neucleus. Tritium is a radioactive isotope.

So while the most common form of hydrogen has no neutrons in its neucleus, other isotopes do.

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