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

Question

anonymous · Answer

1st = 2 electrons
2nd= 8 electrons
3rd= 18 electrons

rvc · Answer

the formula for finding no of e;s in any shell is 2n^2 where n=shell no.
applying this formula 
1st shell = 2 e
2nd shell = 8 e
3rd shell = 18 e
and so on ...                  e=electron

anonymous · Answer

1st shell=2 electrons,
2nd shell=8 electrons,
3rd shell=18 electrons,
4th shell=32 electrons...