A) \[4d\]
B) \[5p\]
C) \[5s\]
D) \[4d\] and \[5s\] will be filled simultaneously
Correct Answer: C
Solution :
According to the Aufbau?s principle, electron will be first enters in those orbital which have least energy. So decreasing order of energy is \[5p\,>\,4d>\,5s.\]You need to login to perform this action.
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