This paper describes an interdisciplinary collaboration of faculty and students from chemistry and mathematics to develop and implement an activity showcasing the relevance of calculus in chemistry to first-semester calculus students. The activity focuses on using calculus optimization methods to maximize the ground-state radial probability distribution function for the hydrogen atom and verify that the Bohr radius gives the desired maximum. Broader goals include encouraging further mathematics study by chemistry students, enhancing awareness of calculus applications to the sciences, preparing students for physical chemistry, and cultivating scientists and mathematicians with broader and deeper backgrounds.