Final answer:
Rubidium has the largest atomic radius among the given elements (Sr, Sn, Rb, In), and Krypton has the smallest atomic radius among K, Kr, Ga, and Ge. Sulfur has a smaller atomic radius than Silicon, while Tellurium has a larger atomic radius than Sulfur.
Step-by-step explanation:
The question involves understanding the trends in atomic radii across the periodic table. As you move down a group, the atomic radius increases because each element has an additional electron shell compared to the one above it. In contrast, as you move across a period from left to right, the atomic radius tends to decrease due to the increase in the positive charge in the nucleus, which pulls the electrons closer. Among the given options (Sr, Sn, Rb, In), Rb (Rubidium) has the largest atomic radius because it is located further down in the periodic table compared to the others.
For the question asking which atom would have the smallest atomic radii among K, Kr, Ga, and Ge, Kr (Krypton) would be the correct answer as noble gases tend to have a complete octet and a relatively smaller radius as they are located at the end of their respective periods.
Similarly, when comparing Si (Silicon) and S (Sulfur), or S (Sulfur) and Te (Tellurium), Sulfur will have a smaller atomic radius than Silicon because it is to the right of Silicon in the same period, and Tellurium will have a larger atomic radius than Sulfur because it is below Sulfur in the same group.