Question

The size of $B{e}^{2+}$ and $A{l}^{3+}$ is not so close but they show diagonal relationship due to

• A. Different effective nuclear charge
• B. Different atomic number
• C. Similar charge per unit area
• D. They do not show diagonal relationship

Answer 1

Answer: (C)

Charge per unit area $=\frac{\text{ Ionic ch arge }}{\frac{4}{3}\pi (\text{ Ionic radius }}$
$\therefore (C)$ is correct answer.