01Structure 1 · Models of the particulate nature of matter10 questionsS1.3 Electron configurations10 questionsStartChoose a focusEnergy levels1 questionEmission and absorption1 questionElectron arrangements1 questionPhoton energy1 questionSpectral interpretation1 questionIonic configurations1 questionSpectroscopic investigations1 questionSuccessive ionization1 questionOrbital occupancy1 questionEvaluating spectral identity1 question