Number of isotopes in hydrogen?

In nature you can find two kinds of hydrogen. The most common is hydrogen with one proton (H). The hydrogen with one proton and one neutron is called deuterium (D).

A third kind is known as tritium (T) (does not exist in nature), with one proton and two neutrons You can find H and D in water. H 2 O is called normal water, while D 2 O is called heavy water often used in nuclear power plants.

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