Question

Question no.6:Which of the following electronic configuration violates Aufbau principle?
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Answer 1

Answer:

Answer is option (C)

Explanation:

Because Aufbau principle states that the orbitals should be filled with increasing energy. 2s being lower in energy than 2p should be filled completely first ,then 2p should be started.

Answer 2

Answer:

Option c

Explanation:

Aufbau principle states that electrons should fill orbitals with lower energy first .

here 2s orbital has lower energy . s orbital can accomodate a maximum of two electrons.

so before entering 2p orbital electron should fill s first.

and only after changing s to s^2 electrons can enter the next orbital 2p

In option c , before filling s completely , electrons have jumped into p orbital, which violates Aufbaus rule.