Question

The pair of elements that has almost same atomic radius among the following is

• A. Zr,Hf
• B. Y, La
• C. Al, Ga
• D. None of the above

Answer 1

The correct option is A Zr,Hf

Due to lanthanoid contraction (poor shielding of 4f electrons), the second and third row transition elements has similar radius except Y and La. Atomic radius of Al is greater than Ga due to poor shielding of 3d electrons.