Electronic Configuration Definition: The arrangement of electrons in various subshells ( s p d f) is called electronic configuration. Subshells are s p d and f . s subshell occupy a maximum of 2 electrons. p subshell occupy a maximum of 6 electrons. d subshell occupy a maximum of 10 electrons. f subshell occupy aTrick to find s p d f Electron Configuration for Carbon, Nitrogen and Oxygen – Chemistry