A) \[3s<3d<4s<4p\]
B) \[1s<2p<4s<3d\]
C) \[2s<5s<4p<5d\]
D) \[2s<2p<3d<3p\]
Correct Answer: B
Solution :
Key Idea: According to aufbau principle, orbitals of any atom are filled in increasing order of energy. The correct order is \[1s<2s<2p<3s<3p<4s<3d<4p<5s<4d\] \[<5p<6s<4f<5d<6p<7s<5f<6d\] \[\therefore \] Choice is the correct answer. \[1s<2p<4s<3d\]
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