What you’ll learn3 learning objectivesChoose one objective for a focused lesson, or study the complete topic.22.4.1There are discrete electron energy levels in isolated atoms (e.g. atomic• understand that there are discrete electron energy levels in isolated atoms (e.g. atomic hydrogen)Syllabus objective22.4.2The appearance and formation of emission and absorption line spectra• understand the appearance and formation of emission and absorption line spectraSyllabus objective22.4.3Hf = E1 – E2• recall and use hf = E1 – E2Syllabus objective