Atomic number refers to the number of protons in the nucleus of an atom. Hence, it is also known as the proton number of the atom.
Mass number refers to the number of protons and neutrons in the nucleus of an atom, or the number of nucleons (term that refers to protons and neutrons together since both are found in the nucleus of the atom). Hence, it is also called the nucleon number of the atom.
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Atomic number refers to the number of protons in the nucleus of an atom. Hence, it is also known as the proton number of the atom.
Mass number refers to the number of protons and neutrons in the nucleus of an atom, or the number of nucleons (term that refers to protons and neutrons together since both are found in the nucleus of the atom). Hence, it is also called the nucleon number of the atom.