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(D) The first ionisation enthalpy $(IE_1)$ of lanthanoids generally increases with an increase in atomic number due to the lanthanoid contraction,whic

Vedclass · Accepted Answer

$Yb$

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(D) The first ionisation enthalpy $(IE_1)$ of lanthanoids generally increases with an increase in atomic number due to the lanthanoid contraction,which leads to a decrease in atomic size and stronger attraction of the nucleus for the valence electrons. Among the given elements,$Ce$ $(Z=58)$,$La$ $(Z=57)$,$Gd$ $(Z=64)$,and $Yb$ $(Z=70)$,the element $Yb$ has the highest atomic number. $Yb$ has a stable electronic configuration of $[Xe] 4f^{14} 6s^2$. Due to the completely filled $4f$ subshell and the highest effective nuclear charge among the options,it requires the most energy to remove the first electron. Therefore,$Yb$ has the highest $IE_1$.

List-$I$ Species	List-$II$ Electronic distribution
$A$. $Cr^{2+}$	$I$. $3d^8$
$B$. $Mn^{+}$	$II$. $3d^3 4s^1$
$C$. $Ni^{2+}$	$III$. $3d^4$
$D$. $V^{+}$	$IV$. $3d^5 4s^1$

Identify the element having the highest first ionisation enthalpy $(IE_1)$ from the following.

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Match List-$I$ with List-$II$

List-$I$ Species List-$II$ Electronic distribution

$A$. $Cr^{2+}$ $I$. $3d^8$

$B$. $Mn^{+}$ $II$. $3d^3 4s^1$

$C$. $Ni^{2+}$ $III$. $3d^4$

$D$. $V^{+}$ $IV$. $3d^5 4s^1$

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