How to fill electrons in k l m n shells when atomic number is greater than 20?
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by using SPDF rule
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2
1s^2 2s^2 2p^6 3s^2 3p^6 4s^2
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k shell = 2
L shell = 8
M shell = 8
N shell = 8
L shell = 8
M shell = 8
N shell = 8
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