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AP Chemistry Exam Prep

Category - AP Chemistry

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Which of the following elements has the largest atomic radius?

Lithium
Boron
Fluorine
Potassium
Rubidium

Explanation

Answer: Rubidium

Atomic radius decreases across a period and increases down a group. Elements in the first group will be the largest in their period. Of these elements, the bottom most element (the element with the highest atomic number) will have the largest atomic radius. Therefore, rubidium has the largest atomic radius of the elements listed.

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