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.
The atomic number of hydrogen is 1, and for carbon, it is 6.
The number of protons an element possesses determines its identity.
The atomic number represents the number of protons present in the nucleus of an atom.
All atoms of the same element have the same atomic number because the number of protons determines the element’s identity and chemical properties. Any change in the number of protons would result in a different element.