The reason for the stability of Gd3+ ion is

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4f subshell-half filled

4f subshell-completely filled

Possesses the general electronic configuration of noble gases

4f subshell empty

answer is A.

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Detailed Solution

Gd(Z=64)⇒4f75d16s2Gd3+=4f7Gd3+ is stable due to the presence of exactly half-filled 4f -'subshell.

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