February 26, 2017

Homework Help: Chemistry

Posted by timmy123 on Friday, October 15, 2010 at 8:22pm.

An atom contains a total of 25 electrons. When the atom is in the ground state, how many different principal energy levels will contain electrons?

a. 1
b. 2
c. 3
d. 4

I really don't get this because I thought energy levels went like 2, 8, 18, 32, and 50, but 25 is between 18 and 32, so is it in the 3rd or 4th level??

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