Chemistry - Atomic Structure Question with Solution | TestHub

Hydrogen 1s radial distribution is proportional to r²e^(-2r/a₀). The mean radius is the ratio of r³ and r² integrals, [3!/(2/a₀)^4]/[2!/(2/a₀)^3]=3a₀/2. With a₀=0.529 Å this is (3/2)×0.529 Å, C, distinct from the most probable radius a₀.