i am so lost. picture in the comments.

Question

melzie · Answer

can you please explain why i got this wrong...? @mathmate

mathmate · Answer

@sweetburger could you help @Melzie ?

sweetburger · Answer

You have to remember that the subshells consistently hold the same number of electrons. The s subshell will always hold exactly 2 electrons, the p subshell will hold 6 electrons, the d subshell will always hold 10, and the f subshell will always hold only 14 electrons. This is unchanging. 
Notice that n=2, l=0 reprsents the 1s subshell which holds a maximum of 2 electrons.

sweetburger · Answer

This graph maybe helpful to help identify quantum numbers in relation to what subshell they represent.

melzie · Answer

thank you so much, ill let you know if i have anymore questions

sweetburger · Answer

Np, glad to help.

melzie · Answer

I am a little intimidated by these, a little help please?

sweetburger · Answer

Sorry totally missed seeing your question earlier. I will start you off with the first one.
For $$1s^22s^22p^6$$ There are a total of 10 electrons which can be determined by taking a sum of the exponents. The valence shell is also full composed of 8 electrons from $$2s^22p^6$$. This electron configuration represents Neon the noble gas.