How do you find out what element is being discussed by the amount of

inneedhelp

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Mar 8, 2013
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electrons it has in each n level? i'm studying for a chemistry test and I am a little confused on how to solve problems like these:
example:

What element contains 4 electrons in it's outermost energy level : n=2 ?

The answer is Carbon, but I'm not sure how you would figure this problem out.

Also could you explain what a cation and anion are, and orbitals and the p,x,y mean?

Thank you so so so much!
 
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