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  4. Which is not in accordance to aufbau principle?

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Q. Which is not in accordance to aufbau principle?

Bihar CECEBihar CECE 2008Structure of Atom

Solution:

Aufbau principle states that in the ground state of an atom, the orbital with lower energy is filled up first before the filling of the orbitals with a higher energy commences.
Increasing order of energy of various orbitals is
$1 s, 2 s, 2 p, 3 s, 3 p, 4 s, 3 d, 4 p, 5 s, \ldots$ etc.
Therefore,
image
is not obeyed by aufbau principle. Without fully filling of $s$ subshell electrons cannot enter in $p$ subshell in ground state of atom.