To see how these ideas fit together, we can use some of Bohr's terminology to get us started:

• each energy level is designated by the value n which is an integer from 1 (lowest energy or "ground state") on up
• the number of types of orbitals possible on an energy level is also equal to n
• the maximum number of actual orbitals on an energy level is equal to n²
• the maximum number of electrons in an orbital is equal to 2
• the maximum number of electrons on an energy level is equal to 2n²

Let's use this information to build up the structure of simple atoms from scratch. Remember, we are concentrating on the electron structure, but every time we add another electron, we also add another proton in the nucleus.