Which lanthanoid from the following has the h | vedclass

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(D) The first ionisation enthalpy $(IE_1)$ of lanthanoids generally increases across the series due to the lanthanoid contraction,which leads to a dec

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$Yb$

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(D) The first ionisation enthalpy $(IE_1)$ of lanthanoids generally increases across the series due to the lanthanoid contraction,which leads to a decrease in atomic size and an increase in effective nuclear charge.Among the given options,$Yb$ (Ytterbium,$Z=70$) 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 high effective nuclear charge,$Yb$ exhibits a very high first ionisation enthalpy compared to the other listed lanthanoids ($Nd$,$Dy$,$Tm$).

Which lanthanoid from the following has the highest first ionisation enthalpy $(IE_1)$?

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