A) 4f subshell - half filled.
B) 4f subshell - completely filled.
C) Possesses the general electronic configuration of noble gases.
D) 4f-subshell empty.
Correct Answer: A
Solution :
[a] \[Gd(Z=64)\Rightarrow 4{{f}^{7}}5{{d}^{1}}6{{s}^{2}}\] \[G{{d}^{3+}}=4{{f}^{7}}\] \[G{{d}^{3+}}\] is stable due to the presence of exactly half-filled 4f-subshell.
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