These are the specific addresses of each electron in the ground state.
First number is principal quantum number, Second number is l= n-1 down to 0, the Third number is -l to +l for orientation possibilities and the last number is for spin, + or - 1/2.
n = 1
1 0 0 -1/2 These are the 1s electrons, 2 total
1 0 0 +1/2
That completes n = 1
n=2
2 1 1 -1/2 These are the 2p electrons, 6 total
2 1 1 +1/2
2 1 0 -1/2
2 1 0 +1/2
2 1 -1 -1/2
2 1 -1 +1/2
2 0 0 -1/2 These are the 2s electrons, 2 total
2 0 0 +1/2
This completes n=2 with a total of 8 electrons
For n= 3 you'll have 18 electrons. You'll have l values of 2, 1 and 0 which correspond to the d, p and s orbital shapes. Remember your third column goes from whatever l value you are on from -l to + l and there is always a + or - 1/2 for the fourth number.
have fun.
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