The element’s atomic number is determined by the number of
positively charged particles (protons) inside the nucleus of an atom. In other words, each element has a rare
number that identifies the number of protons are in an atom.
As the elements categorically have their own number of
negatively charged particles (electrons), we will be able to determine and identify
the element from these numbers.
Say for instance, Hydrogen atoms. All hydrogen atoms, and a
hydrogen atom only contains a
proton and logically has an atomic
number of 1.