Question

1. which of these elements has the larger atomic radii and why? a. f is the largest because it has the most principal energy levels. b. f is the largest because it has the most amount of shielding effect. c. cl is largest because it has the most principal energy levels. d. cl is the largest because it has the least amount of shielding effect.

Explanation:

Atomic radius increases down a group in the periodic table. Fluorine (F) and chlorine (Cl) are in the same group (Group 17 - halogens), and Cl is below F. As you move down a group, the principal energy levels increase, leading to a larger atomic radius. Also, the shielding effect increases with more electron - filled principal energy levels. Cl has more principal energy levels than F, so it has a larger atomic radius and a greater shielding effect.

Answer:

D. Cl is the largest because it has the least amount of shielding effect. (Note: This option seems to have an incorrect reasoning as Cl has more shielding effect due to more energy levels, but among the given options this is the one that correctly identifies Cl as the atom with larger atomic radius)