A) \[5p<4f<6s<5d\]
B) \[5p<6s<4f<5d\]
C) \[4f<5p<5d<6s\]
D) \[5p<5d<4f<6s\]
Correct Answer: B
Solution :
According to Aufbau principle electron are filled in various atomic orbital in the increasing order of energy 1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d < 5p < 6s < 4f < 5d < 6p < 7s.
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