question_answer

Which of the following is not correct according to Aufbau's rule?

A)  

B)  

C)  

D)  

Correct Answer: C

Solution :

 The Aufbau principle states that in the ground state of an atom, an electron enters the orbital of lowest energy first and subsequent electrons are fed in the order of increasing energies. The relative energies of various orbitals are given as \[1s,2s,2p,3s,3p,4s,3d\] Hence,  is not true according to aufbau principle.