A) \[35\text{ }<\text{ }3d\text{ }<\text{ }45\text{ }<\text{ }4p\]
B) \[1s\text{ }<\text{ }2p\text{ }<\text{ }4s\text{ }<\text{ }3d\]
C) \[2s\text{ }<\text{ }55\text{ }<\text{ }4p\text{ }<\text{ }Sd\]
D) \[2s\text{ }<\text{ }2p\text{ }<\text{ }3d\text{ }<\text{ }3p\]
Correct Answer: B
Solution :
According to aufbau principle, "sub-shells are filled with electrons in the increasing order of their energies," i.e., sub-shell of lower energy will be filled first with electrons. Thus correct order is? \[1s<2s<2p<3s<3p<4s<3d<4p\] \[<5s<4d<5p<6s<4f<5d<6p\] \[<7s<5f<6d...\text{ }etc.\]
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