A) \[Tb\]
B) \[Er\]
C) \[Ce\]
D) \[Lu\]
Correct Answer: D
Solution :
On going from left to right in lanthanoid series ionic, size decreases i.e. \[C{{e}^{3+}}>T{{b}^{3+}}>E{{r}^{3+}}>L{{u}^{3+}}.\]
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