A) \[[Xe]4{{f}^{7}}5{{d}^{1}}6{{s}^{2}}\]
B) \[[Xe]4{{f}^{6}}5{{d}^{2}}6{{s}^{2}}\]
C) \[[Xe]4{{f}^{8}}5{{d}^{2}}\]
D) \[[Xe]4{{f}^{9}}6{{s}^{1}}\]
Correct Answer: A
Solution :
\[{{\,}_{64}}Gd={{\,}_{54}}[Xe]6{{s}^{2}}4{{t}^{7}}5{{d}^{1}}\]
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