What you’ll learn6 learning objectivesChoose one objective for a focused lesson, or study the complete topic.—E.1.1—Rutherford experiment• Geiger-Marsden-Rutherford experiment and the discovery of the nucleus.Syllabus objective—E.1.2—Nuclear notation• Use nuclear notation: A = nucleon number, Z = proton number, X = element symbol.Syllabus objective—E.1.3—Atomic energy levels• Emission and absorption spectra provide evidence for discrete atomic energy levels.Syllabus objective—E.1.4—Atomic transitions• Photons are emitted/absorbed during transitions between atomic energy levels.Syllabus objective—E.1.5—Photon energy• Photon energy in atomic transition: E=hf.Syllabus objective—E.1.6—Spectra and composition• Use emission and absorption spectra to infer chemical composition.Syllabus objective