The reason for the stability of the Gd^{3+} i | vedclass

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(A) The atomic number of Gadolinium $(Gd)$ is $64$. Its electronic configuration is $[Xe] 4f^7 5d^1 6s^2$. When it forms a $Gd^{3+}$ ion,it loses thre

Vedclass · Accepted Answer

$4f$ subshell is half-filled

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(A) The atomic number of Gadolinium $(Gd)$ is $64$. Its electronic configuration is $[Xe] 4f^7 5d^1 6s^2$. When it forms a $Gd^{3+}$ ion,it loses three electrons ($2$ from $6s$ and $1$ from $5d$). The resulting electronic configuration is $[Xe] 4f^7$. Since the $4f$ subshell can hold a maximum of $14$ electrons,a configuration of $4f^7$ represents a half-filled subshell,which provides extra stability due to exchange energy and symmetry.

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

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