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Question

The reason for the stability of Gd+3 ion is:

A
A half filled 4f subshell
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B
A completely filled 4f subshell
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C
It possesses the general electronic configuration of a noble gas
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D
It has an empty 4f subshell
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Solution

The correct option is A A half filled 4f subshell
Electronic configuration of gadolinium:
Gd=[Xe]4f75d16s2
Gd+3=[Xe]4f75d06s0

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