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  4. The reason for the stability of Gd3+ ion is

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Q. The reason for the stability of $Gd^{3+}$ ion is

The d-and f-Block Elements

Solution:

$Gd(Z = 64) \to [Xe] 4 f^75d^1 6s^2$
$\therefore Gd^{3+} \to [Xe]4f^7$
$Gd^{3+}$ is highly stable due to stable half-filled configuration.