Which transition elements of the 3d series ha | vedclass

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(A) The electronic configuration of $3d$ series elements generally follows the $(n-1)d^{1-10}ns^{1-2}$ pattern. However,$Cr$ $(Z=24)$ has the configur

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$Cr$ and $Cu$

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(A) The electronic configuration of $3d$ series elements generally follows the $(n-1)d^{1-10}ns^{1-2}$ pattern. However,$Cr$ $(Z=24)$ has the configuration $[Ar] 3d^5 4s^1$ instead of $3d^4 4s^2$ to achieve extra stability from a half-filled $d$-subshell. Similarly,$Cu$ $(Z=29)$ has the configuration $[Ar] 3d^{10} 4s^1$ instead of $3d^9 4s^2$ to achieve extra stability from a completely filled $d$-subshell.

Which transition elements of the $3d$ series have an exceptional electronic configuration?

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