4/11/2016. There's no way I would ever rate a box store 5 stars, but I do like our Home Depot. The service isn't always the greatest, but it's usually pretty decent. The have a wide selection and the prices are generally the best in town.
Electrons with the highest energy levels exist in the outermost shell of an atom and are relatively loosely bound to the atom. This outermost shell is known as the valance shell and electrons in this shell are called valance electrons. A completed outermost shell has valance of zero.
Unformatted text preview: Zinc is in period 4 in the d-block. The highest occupied principal energy level is n=4. Boron is in period 2 in the p-block. The highest occupied principal energy level is n=2. GUIDE Exercise #20 7. Why are the gases in Group 18 called the noble gases? (How is this related to the occupation of the energy sublevels?) 8. Why do Group 1 metals lose only one electron when they are oxidized? Why do Group 2 metals lose two electrons? How is this related to the energy sublevels and orbitals? 9.