Question

What is the maximum number of electrons that can be contained in the first, second, third, and fourth energy levels, respectively?

Express your answer as integers separated by commas.

Answer 1

Seriously don't you have a text book? If not, watch this:
http://ocw.mit.edu/courses/chemistry/5-111-principles-of-chemical-science-fall-2008/video-lectures/lecture-6/

Answer 2

First shell is a max of 2,
Second shell is a max of 8
3rd shell is 18
4th shell is 32
\[\max number \in shell n=2n ^{2}\]

Answer 3

Maximuim number electrons allowed in shell n, is 2n^2