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Q.

The reason for the stability of Gd³⁺ ion is

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a

4f sub shell empty

b

4f sub shell half-filled

c

4f sub shell completely filled

d

possesses the electronic configuration of noble gases

answer is A.

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Detailed Solution

$Gd (Z = 64) \Rightarrow 4 f^{7} 5 d^{1} 6 s^{2}$

${Gd}^{3 +} = 4 f^{7}$

${Gd}^{3 +}$ is stable due to the presence of exactly half-filled 4f-subshell.

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