Question

which of following has highest radius A) cr3+B)mn3+C)Fe3+D)co3+​

Answer 1

$\bold{Cr^{3+}}$ has highest radius due to the increasing of effective nuclear charge.

Step by step explanation:

Atomic radius:

of an atom's nucleus to it's outermost energy level.

• Across a period atomic radius decreases.
• Down a group atomic radius increases

The given elements are as follows.

$\bold{Cr^{3+},Mn^{3+},Fe^{3+},Co^{3+}}$

All these elements are belongs to the 4th period.

Across the period atomic radius decreases. Therefore, $\bold{Cr^{3+}}$ has highest radius due to the increasing of effective nuclear charge.