Which of the following sets of orbitals is arranged in the correct order of increasing energy ?

Foundation

Chemistry Foundation

Quantum Number and Electronic Configuration

Question

4s < 3d < 4p < 5s < 4d

3d < 4s < 4p < 6s < 4d

1s < 2s < 2p < 4d < 3f

2s < 3d < 4p < 4f < 1s

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The value of (n+ℓ) is increasing in this order.