An ionized atom having Z protons has had all but one of its electrons removed. If R is the radius of the ground state electron orbit in atomic hydrogen, then what is the radius of the shell of the remaining electron in the ionized atom? Answer Choices: Solution Fourth option is the correct answer. radius of the shell = R/Z radius of shell in hydrogen like Ions, r = 0.529*10^-9*n^2/z if n = 1 r = 0.529*10^-9/z so, r is inversly proportional to z .