What is the correct filling order of orbitals according to the Aufbau principle? - ATOMIC STRUCTURE Quiz | GKFix.in

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Question

What is the correct filling order of orbitals according to the Aufbau principle?

A. 3d comes before 4s
B. 4p comes before 4s
C. 4s comes before 3d
D. 5s comes before 4p

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