Valence electrons are often located in incompletely filled main-energy levels.
{"Image DocumentName": "Valence electrons are often located in incompletely filled main-energy levels.", "Image ImageDescription": "For example, the electron lost in Na to form Na+ is from the 3s sublevel. For the main group elements, the valence electrons are the electrons in the outermost s and p sublevels. The inner electrons are in filled energy levels and are held to tightly to be involved.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}