Question

Ionic radii vary in

• A. direct proportion to the screening effect.
• B. inverse proportion to the square of effective nuclear charge.
• C. inverse proportion to the effective nuclear charge.
• D. direct proportion to the square of screening effect

Answer 1

Answer: (A), (C)

inverse proportion to the effective nuclear charge.

Ionic radii are inversely proportional to the effective nuclear charge and directly proportional to the screening effect.

Stronger the effective nuclear charge, more strongly the electrons are held to the nucleus and the size gets reduced. Also, as the inner orbital electron increases, the screening effect increases. So, electrons are loosely held by the nucleus and the size increases.

Hence, options (A) and (C) are correct.