Question

The radius of lanthanum is $1.06\mathring{A}$. Then which of the following is closest to the radius of $L{u}^{3+}$ ion?

• A. $1.6\mathring{A}$
• B. $0.85\mathring{A}$
• C. $1.06\mathring{A}$
• D. $1.4\mathring{A}$

Answer 1

Answer: (B)

Due to lanthanoid contraction.