Hydrogen has three isotopes: protium (1/1 H), deuterium (2/1 H or D), and tritium (3/1 H or T).
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Isotopes are atoms of the same element with the same atomic number but different mass numbers. For example, carbon has isotopes with mass numbers 12 and 14.
The mass of an atom primarily comes from its protons and neutrons, which are concentrated in the nucleus.
Nucleons are the collective term for protons and neutrons, which are found in the nucleus of an atom.
Because atomic number (Z) signifies the number of protons in an atom’s nucleus, and this characteristic uniquely identifies each element.