Example image of eyePlorer eyePlorer map for 'Electron shell': Atom Atomic nucleus Electron Orbit Valence electron Electron configuration Charles Glover Barkla Henry Moseley X-ray Principal quantum number Siegbahn notation Bohr model Gilbert N. Lewis Physical chemistry Linus Pauling Quantum mechanics Atomic orbital Azimuthal quantum number Atomic spectral line Aufbau principle Extension of the periodic table beyond the seventh period Period 8 element Periodic table Alkali Halogen Noble gas Ununseptium Group (periodic table) Actinoid Lanthanoid Palladium Degenerate orbital Hypervalent molecule Octet rule Open shell Proximity effect (atomic physics) Spdfgh Superactinide Tetravalence Wiswesser's rule 18-Electron rule Group 7 element Lone pair Noble gas compound Period 5 element Periodinane Electrovalency Nitrogen group Transactinide element Xenon tetroxide