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In which of the following Aufbau princip...

In which of the following Aufbau principle is violated?

A

`1s^2 2s^2 2p^6 3s^2 3p^1`

B

`1s^2 2s^2 2p^6 3s^2 3p^6 4s^1`

C

`1s^2 2s^2 2p^6 3s^2 3p^6 4s^1 3d^1`

D

`1s^2 2s^2 2p^6 3s^2 3p^6 3d^2`

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