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The definition of an atomic number is the number of protons in the nucleus of an atom of an element. Three for lithium and 20 for calcium are each an example of an atomic number.
Atomic number is the number of protons in the nuclei of the atoms of a given element. The elements on the periodic table are arranged according to increasing atomic number. Foâ¦r example, carbon's atomic number is 6, so it has 6 protons in the nuclei of all of its atoms. Mass number is the number of protons and neutrons in the nuclei of the atoms of a particular isotope of an element.