Question: why is it 3s 3d? not 4s 3d? the bottom one says 5s 4d and according to the rule I learned that 3d comes after

 why is it 3s 3d? not 4s 3d? the bottom one
why is it 3s 3d? not 4s 3d?
the bottom one says 5s 4d and according to the rule I learned that 3d comes after 4s.
please give me a through explanation.

8 [Ar] 353d [kr] 5s4d

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