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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.
The atomic number tells you the number of. in one atom of an element. It also tells. you the number of in a neutral atom of that element. The atomic number gives the identity of. an element as well as it's location on the Periodic Table. No two different elements will have the. atomic number. The mass number is used to calculate the number of. calculate the number of neutrons you must subtract the #. in one atom of an elemen. from the.