## Chemistry Resources

### for students and teachers

Steve Marsden’s

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 n^{2} - the
*maximum*number of electrons in an orbital is equal to 2 - he
*maximum*number of electrons on an energy level is equal to 2n^{2}

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.*