The +3 Ion Of Which One Of The Following Has Half-filled 4f subshell?

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Question

The +3 ion of which one of the following has half-filled 4f subshell?

Solution

Correct option is

Gd

 

Gd = [Xe] 4f7 5d1 6s2,

Gd3+ = [Xe] 4f7  (half-filled)

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