If an atom has seven electrons how many are in the second shell?

A. 2

B. 5

C. 7

D. You need to know the number of protons to figure this out.

If it had seven electrons then we know that the first energy lever has to have two and no more and so it would be 5 as you will only have 5 left. if you had more then 8 then there would be three but these not so your fine! 5 electrons on other shell

5 electrons because first shell can only have two electrons and second can hold up until 8