You know that a neutral oxygen atom has 8 electrons.
It’s always helpful to write the for an element before trying to assign for each individual electron . As you can see in the image above, the for neutral oxygen is
##”O”: 1s^(2) 2s^(2) 2p^(4)##
Assuming you know the basics behind , you can write the unique 4-number set for each electron belonging to oxygen like this
The first energy level:
##”n=1″##, ##”l=0″##, ##”m”_l”=0″##, ##”m”_s”=-1/2″## ##->## the electron located in the 1s-orbital, spin-down;
##”n=1″##, ##”l=0″##, ##”m”_l”=0″##, ##”m”_s”=+1/2″## ##->## the electron located in the 1s-orbital, spin-up;
The second energy level:
##”n=2″##, ##”l=0″##, ##”m”_l”=0″##, ##”m”_s”=-1/2″## ##->## the electron lcoated in the 2s-orbital, spin-down;
##”n=2″##, ##”l=0″##, ##”m”_l”=0″##, ##”m”_s”=+1/2″## ##->## the electron located in the 2s-orbital, spind-up;
##”n=2″##, ##”l=1″##, ##”m”_l”=-1″##, ##”m”_s”=-1/2″## ##->## the electron located in the ##”2p”_x”-orbital”##, spin-down;
##”n=2″##, ##”l=1″##, ##”m”_l”=-1″##, ##”m”_s”=+1/2″## ##->## the electron located in the ##”2p”_x”-orbital”##, spin-up;
##”n=2″##, ##”l=1″##, ##”m”_l”=0″##, ##”m”_s”=+1/2″## ##->## the electron located in the ##”2p”_y”-orbital”##, spin-up;
##”n=2″##, ##”l=1″##, ##”m”_l”=1″##, ##”m”_s”=+1/2″## ##->## the electron located in the ##”2p”_z”-orbital”##, spin-up;
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