Question

which rule is violated in electronic
configuration 1s°2s²2p⁶​

Answer 1

Answer:

Aufbau Principle is violated as the orbital having lower energy must be filled first. So 1s could not be vacant in 1s

0

2s

2

2p

4

.

An electron having the lowest value of (n+l) will be filled first.

Explanation:

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Answer 2

Answer:

AUFBAU'S PRINCIPLE

Explanation:

Explanation:

Aufbau's Principle states that in a non-excited (ground) state, electrons in the lower energy orbitals are filled before those in the higher energy orbitals .

The energy order of few orbitals is :

1S < 2S < 2P < 3S <3P < 4S < 3D ......

In the question however, it is clearly seen that electrons have filled the higher orbitals (2S and 2P) before filling the 1S.

So this kind of orbital filling is not possible and hence violates Aufbau's rule.

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