Question

Which of the following is true regarding the trend in atomic size?

• A. For d block elements, there is a regular increase in atomic radius as we move from left to right across the periodic table for the first transition series
• B. As we move down the group 13, there is a regular increase in atomic radius
• C. Atomic radius of Ne is greater than that of F
• D. All of the above

Answer 1

The correct option is C Atomic radius of Ne is greater than that of F

a) Since, d electrons in the inner shell are filled, there is significant increase in the screening effect. It decreases from Sc to Cr and then remains constant until Cu and then increases again.

b) Due to poor shielding of d electrons, Ga has slightly smaller atomic radius than Al.

c) Since Ne has van der waals radius which is greater than the covalent radius, Ne has higher atomic radius than F.
Hence, C is the right answer.