A) \[La\]
B) \[Lu\]
C) \[Pr\]
D) \[Pm\]
Correct Answer: A
Solution :
Those element in which last electron enters in the\[4f-\]orbital are called lanthanoid elements. There are fourteen elements in the lanthanoid series from Ce (Z = 58) to Cu (Z = 71). Lanthanum (La) is a non-lanthanoid element because the valence electron goes into Sd-orbital not in\[4f-\]orbital. \[La(Z=57):[Xe]\,5{{d}^{1}}6{{s}^{2}}\]
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