Definitions for "Atomic Number"
The atomic number (Z) of an atom or an element represents the number of protons of the atom/element. For example carbon has 6 protons, thus, its atomic number Z=6. Oxygen, with its 8 protons has Z=8. See also mass number
The number of protons in the nucleus of a given atom. Elements are distinguished from each other by their atomic numbers.
the number of protons in the nucleus of the chemical element.
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