Which of the following has second ionisation | vedclass

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(B) The correct answer is $(B)$ $Zn$. The electronic configuration of $Zn$ is $[Ar] 3d^{10} 4s^2$. The first ionisation potential removes one $4s$ ele

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$Zn$

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(B) The correct answer is $(B)$ $Zn$. The electronic configuration of $Zn$ is $[Ar] 3d^{10} 4s^2$. The first ionisation potential removes one $4s$ electron,leaving $[Ar] 3d^{10} 4s^1$. The second ionisation potential involves removing the remaining $4s$ electron. Since the $3d^{10}$ subshell is completely filled,it provides a strong shielding effect,which reduces the effective nuclear charge felt by the $4s$ electron,making it easier to remove than expected compared to other transition metals.

Which of the following has second ionisation potential less than expected?

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