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Q.
Which one violates Aufbau principle ?
NTA AbhyasNTA Abhyas 2020
Solution:
According to Aufbau principle increasing order of energy of various orbitals is
1s, 2s, 2p, 3s, 3p, 4s 3d, 4p, 5s, etc.
Therefore,
is not obeyed by Aufbau principle. Without fully filling of s-subshell electron cannot goes p-subshell in ground state of atom.
