Which of the following statements is incorrec | vedclass

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(A) $1$. In $Sc$ $(Z=21)$,the electronic configuration is $[Ar] 3d^1 4s^2$. The effective nuclear charge $(Z_{eff})$ is calculated as $Z - \sigma$. Du

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Effective nuclear charge for electrons of $3d$ and $4s$ subshells is the same in $Sc$.

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(A) $1$. In $Sc$ $(Z=21)$,the electronic configuration is $[Ar] 3d^1 4s^2$. The effective nuclear charge $(Z_{eff})$ is calculated as $Z - \sigma$. Due to different shielding effects of $3d$ and $4s$ electrons,their $Z_{eff}$ values are not the same. Thus,statement $A$ is incorrect.$2$. The increase in $Z_{eff}$ across a period is generally $0.65$ per step,which is a standard observation in Slater's rules,making statement $B$ correct.$3$. For $H^-$ $(1s^2)$ and $He$ $(1s^2)$,the screening constant $\sigma$ for one electron due to the other is $0.30$. Thus,statement $C$ is correct.$4$. $Z_{eff}$ is fundamentally dependent on the shielding constant,which varies with the principal quantum number $(n)$ and orbital type,making statement $D$ correct.

Which of the following statements is incorrect?

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