Question

How many electrons are in the n = 2 orbit for the Periodic Table entry for sodium.

Answer 1

What do you think the answer is?

Answer 2

n stands for principal quantum number which n shows the number of the energy level we are dealing with. In this case the energy level is 2.

In order to find the number of electrons. We use 2n^2 which in this case replace 2 with n and you get your answer.

For more information, you can use n^2 to find the number of orbitals in an energy level.

If you have any question feel free to ask me to clarify it much more for you.