Electron shell: The collective states of all electrons within an atom possessing the identical principal quantum amount (visualized as an orbit wherein the electrons go). Subsequent, Bohr was instructed by his Pal, Hans Hansen, the Balmer collection is calculated utilizing the Balmer formulation, an empirical equation found by Johann Balmer https://gandula.de/2024/08/01/ein-leitfaden-fur-anfanger-zum-verstandnis-der-funktionsweise-von-bohrmaschinen/