A. 1S22S22PX22py22pz03s0
B. 1S22S22PX22py12pz13s0
C. 1S22S22PX12py12pz13s1
D. 1S22S22PX22py22pz03s1

Correct Answer:

Option C – 1S22S22PX12py12pz13s1

Explanation

Shells and subshells are filled in energy level order, so electrons will fill the 4s subshell before the 3d shell.

And the x subshell before the y and z.

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