For d-block elements,the first ionization pot | vedclass

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(A) The first ionization energy $(IE_1)$ generally increases with an increase in atomic number across a period due to the increase in effective nuclea

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$Zn > Fe > Cu > Cr$

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(A) The first ionization energy $(IE_1)$ generally increases with an increase in atomic number across a period due to the increase in effective nuclear charge.However,the trend is irregular among $d-$block elements due to shielding effects and stable electronic configurations.Comparing the given elements:$Zn (3d^{10} 4s^2)$ has a completely filled $d-$orbital and $s-$orbital,making it very stable.$Fe (3d^6 4s^2)$ has a relatively high $IE_1$.$Cu (3d^{10} 4s^1)$ has a filled $d-$subshell but a single $s-$electron.$Cr (3d^5 4s^1)$ has a half-filled $d-$subshell.Based on experimental data for the first ionization potential,the order is $Zn > Fe > Cu > Cr$.

For $d-$block elements,the first ionization potential is of the order:

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