Scanning through the periodic table in order of increasing atomic number, notice

Question

Scanning through the periodic table in order of increasing atomic number, notice that the electrons usually fill the subshells in such a way that those subshells with the lowest values of n + l are filled first. If two subshells have the same value of n + l, the one with the lower value of n is generally filed first. Using these two rules, write the order in which the subshells are filled through n + l = 7. (Enter your answers as a comma-separated list. For example: 1s, 2p, 3f. Enter your answers in the order in which they are filled for each subshell.)

Explanation / Answer

n+1 = 1 for 1s only

n+1 = 2 for 2s only

n+1 = 3 for 2p and 3s

2p will be filled before 3s

n+1 = 4 for 3p and 4s

order of filling : 3p,4s

n+1 = 5 for 3d,4p and 5s

order of filling : 3d,4p,4s

n+1=6 for 4d,5p and 6s

order of filling : 4d,5p,6s

n+1 = 7 for 4f,5d,6p and 7s

order of filling : 4f,5d,6p,7s

Answers:

n+l=1

1s

n+l=2

2s

n+l=3

2p,3s

n+l=4

3p,4s

n+l=5

3d,4p,4s

n+l=6

4d,5p,6s

n+l=7

4f,5d,6p,7s

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