A) \[[Xe]4{{f}^{8}}5{{d}^{1}}6{{s}^{2}}\]
B) \[[Xe]4{{f}^{7}}5{{d}^{1}}6{{s}^{2}}\]
C) \[[Xe]4{{f}^{3}}5{{d}^{5}}6{{s}^{2}}\]
D) \[[Xe]4{{f}^{6}}5{{d}^{2}}6{{s}^{2}}\]
Correct Answer: B
Solution :
[b] Electronic configuration of gadolinium is \[[Xe]4{{f}^{7}}5{{d}^{1}}6{{s}^{2}}\]
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