Question

Ionic radii gradually increases from $S{c}^{+2}toC{u}^{+2}$ in 3d series – True or False?

• A. True
• B. False

Answer 1

Answer: (B)

False

Ionic radii for $S{c}^{2+}andT{i}^{2+}$ are not even defined! Similar to the atomic radii, there is no proper trend in ionic radii either. For $V^{2+}$ the ionic radius is 79 pm and for both $C{r}^{2+}andM{n}^{2+}$, the ionic radii are 82 pm. From $M{n}^{2+}toN{i}^{2+}$, there is a minor but gradual decrease. From there the ionic radii for $C{u}^{2+}andZ{n}^{2+}$ increases!