So, we have a hydrogen atom. What is the probability of an electron being found in a spherical shell with 0,01Å width and a radious of 0,35Å? By approximation, we can sonsider the value of ψ (1s) stable within the shell, and thus the chance is ψ2 x Volume. Right? Also, by considering 0,35Å the median radious, can I express the probability as 0,345∫0,355 0∫2π 0∫2π ψ2 r2 sineφ dr dφ dθ ? Would that give a more accurate solution?