Question

The correct order of ionic radii of $Y^{3+},$ $L{a}^{3+},$ $E{u}^{3+}$ and $L{u}^{3+}$ is

• A. $Y^{3+}<L{a}^{3+}<E{u}^{3+}<L{u}^{3+}$
• B. $L{u}^{3+}<E{u}^{3+}<L{a}^{3+}<Y^{3+}$
• C. $L{a}^{3+}<E{u}^{3+}<L{u}^{3+}<Y^{3+}$
• D. $Y^{3+}<L{u}^{3+}<E{u}^{3+}<L{a}^{3+}$

Answer 1

Answer: (B)

Ionic radii of lanthanide $(L{a}^{3+})$ decrease with increase in atomic number. $L{u}^{3+}<E{u}^{3+}<L{a}^{3+}<Y^{3+}$