# How does the Z, "atomic number" relate to atomic structure?

The atomic number, $Z$, specifies the number of protons, positively charged nuclear particles, present in the nucleus of an atom. And $Z$ specifies the identity of the element. $Z = 1$, the element is hydrogen; $Z = 2$, the element is helium; $Z = 3$, the element is lithium; ..........................$Z = 47$, the element is silver.