"Atomic number"Atomic number, ZZ, is specified by the by the number of nuclear protons. For Z=1Z=1 we have the element "hydrogen"hydrogen; Z=2Z=2, "helium"helium; ...........Z=23Z=23, we have the element "vanadium"vanadium............
The "Noble gases"Noble gases have Z=2, 10, 18,36Z=2,10,18,36 etc. And these numbers reflect electronic structure as well as nuclear structure. The moral? ANY two different elements have different values of ZZ.