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 + t, the one with the lower value of n is generally filled 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

1s (n+l=1)

2s (n+l=2)

2p 3s (n+l=3)

3p 4s (n+l=4)

3d 4p 5s (n+l=5)

4d 5p 6s (n+l=6)

4f 5d 6p 7s (n+l=7)

if n+l is same then lower value of n will filled first

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