Which of the following has the largest atomic radius?

Question

Quizplus · Accepted Answer

Ba (Barium) has the largest atomic radius among the options given. Atomic radius generally increases as you move down a group in the periodic table because each row adds a new electron shell. Barium is below strontium (Sr) in the same group, making it larger than Sr, and the others listed are either in the same period as Ba but to the right (making them smaller due to increased nuclear charge pulling electrons closer) or in a different group and period altogether but not in a position that would make them larger than Ba.

Which of the Following Has the Largest Atomic Radius