Chapter 28 - Quantum Mechanics and Atomic Physics - Learning Path Questions and Exercises - Conceptual Questions - Page 961: 5

If the proton's charge were decreased, it would attract the electron less strongly, so the electron would not be held as close to the proton. Therefore, the electron would be less likely to be found as close to the proton as it now is, and the radius of the probability cloud would increase.

If the proton's charge were decreased, it would attract the electron less strongly, so the electron would not be held as close to the proton. Therefore, the electron would be less likely to be found as close to the proton as it now is, and the radius of the probability cloud would increase.