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

4 f sub shell empty

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4 f sub shell- completely filled

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Possesses the general electronic configuration of noble gases

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4 f sub shell- half filled

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Solution

The correct option is D 4 f sub shell- half filled
Gd= $4 f^{7} 5 d^{1} 6 s^{2}; G d^{3 +} = 4 f^{7}$

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