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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.
General Chemistry/Numbers Used to Describe Atoms - Numbers. 1  The Atomic number is the number of protons in the nucleus of an atom. This number determines the element type of the atom. 2  The atomic number is sometimes denoted Z. Continuing with the example of neon, Z = 10 {\displaystyle Z=10} .