Question

Minimum ionic radii among the following is of

• A. $C{e}^{3+}$
• B. $P{r}^{3+}$
• C. $S{m}^{3+}$
• D. $E{u}^{3+}$

Answer 1

The correct option is D $E{u}^{3+}$

(i) Order of ionic radii $C{e}^{3+}>P{r}^{3+}>S{m}^{3+}>E{u}^{3+}$
In Lanthanoids, ionic size decreases gradually with increase in atomic number.