Chemistry - Complete d-block Question with Solution | TestHub

In a period on moving from left to right ionic radii decreases.

a. So order of cationic radii is

$\text{C}{\text{r}}^{2+}>\text{M}{\text{n}}^{2+}>\text{F}{\text{e}}^{2+}>\text{N}{\text{i}}^{2+}$and

b.$\text{S}\text{c}>\text{T}\text{i}>\text{C}\text{r}>\text{M}\text{n}$

(correct order of atomic radii)

c. For unpaired electron

$\text{M}{\text{n}}^{2+}\left(\text{F}\text{i}\text{v}\text{e}\right)>\text{N}{\text{i}}^{2+}\left(\text{T}\text{w}\text{o}\right)<\text{C}{\text{o}}^{2+}\left(\text{T}\text{h}\text{r}\text{e}\text{e}\right)<\text{F}{\text{e}}^{2+}\left(\text{F}\text{o}\text{u}\text{r}\right)$

d. For unpaired electrons

$\text{F}{\text{e}}^{2+}\left(\text{F}\text{o}\text{u}\text{r}\right)>\text{C}{\text{o}}^{2+}\left(\text{T}\text{h}\text{r}\text{e}\text{e}\right)<\text{N}{\text{i}}^{2+}\left(\text{T}\text{w}\text{o}\right)<\text{C}{\text{u}}^{2+}\left(\text{O}\text{n}\text{e}\right)$