Question

which rule is violated in the electronic configuration of 1s

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Answer 1

Explanation:

Rule which is violated is Aufbau's Principle. Explanation: According to Aufbau's principle, electrons should be filled first in lowest energy orbitals. so electron should first enter into 1s theh remaining.

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Answer 2

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Rule which is violated is Aufbau's principal.

Explanation:

According to Afbau's principal,electons should be filled first in lowest energy orbitals.

The order of orbitals in increasing order of energies are

1s,2s,2p,3s,3p,4s,4d

So electron should first enter into 1s and then in the remaining shells.

So correct electronic configuration is

1s^2,2s^2,3s^2.