Question

guys which rule is violated and how​

Answer 1

Answer:

Aufbau rule

Explanation:

Aufbau principle states that lowest energy shells should be filled first.But in the above mentioned example 3s is missing.So, Aufbau rule is violated.

It should be

1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6

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Answer 2

u need to fill the 3s orbital before filling the 3p orbital

4s orbital should be filled before 3d orbital

only in case of Cu Instead of 4s2 3d9 we write 4s1 3d10 due to the stability of halfly filled configurations of s and d ORBITALS

1s2 2s2 2p6 3s2 3p6 4s2 3d10

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