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Assertion : $\mathrm{Yb}^{2+}$ is more stable as compare to $\mathrm{Gd}^{2+}$.
Reason : The electronic configuration of Gd is [ $\mathrm{Xe}] 4 f^7 5 d^2 6 s^2$.
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Reason : The electronic configuration of Gd is [ $\mathrm{Xe}] 4 f^7 5 d^2 6 s^2$.
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The correct answer is:
If assertion is true but reason is false.
$\begin{aligned} & \text { } \mathrm{Yb}^{2+}=[\mathrm{Xe}] 4 f^{14} 5 d^0 6 s^0 \\ & \mathrm{Gd}^{2+}=[\mathrm{Xe}] 4 f^7 5 d^1 6 s^0\end{aligned}$
Because of fully filled $4 f$ orbital, $\mathrm{Yb}^{2+}$ is more stable than $\mathrm{Gd}^{2+}$.
Because of fully filled $4 f$ orbital, $\mathrm{Yb}^{2+}$ is more stable than $\mathrm{Gd}^{2+}$.
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