The Aufbau principle is not satisfied by whic | vedclass

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(B) The Aufbau principle states that electrons fill lower energy orbitals before higher energy ones. Exceptions to this rule occur due to the extra st

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$Cu$ and $Ag$

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(B) The Aufbau principle states that electrons fill lower energy orbitals before higher energy ones. Exceptions to this rule occur due to the extra stability provided by half-filled or fully-filled $d$-orbitals. For $Cr$ $(Z=24)$,the configuration is $[Ar] 3d^5 4s^1$ instead of $[Ar] 3d^4 4s^2$. For $Cu$ $(Z=29)$,the configuration is $[Ar] 3d^{10} 4s^1$ instead of $[Ar] 3d^9 4s^2$. Similarly,$Ag$ $(Z=47)$ shows an exceptional configuration of $[Kr] 4d^{10} 5s^1$. Therefore,the pair $Cu$ and $Ag$ exhibits deviations from the standard Aufbau filling order.

The Aufbau principle is not satisfied by which of the following pairs of elements?

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