The atomic number of an atom is its number of protons. For instance, a hydrogen atom has an atomic number of one, meaning there is one proton in one hydrogen atom. Also, as there are the same number...
The atomic number of an Element refers to it's position in The Periodic Table. The first element (Hydrogen - H) has the atomic number 1. The second element (Helium - He) has the atomic number 2. The...