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§15.1 The halogens 15.1.1 The halogens 15.1.2 The elemental substances 15.1.3 Hydrogen halides 15.1.4 Halides and Polyhalides 15.1.5 halogen oxyacids §15.1 The halogens 15.1.5 halogen oxyacids 15.1.4 Halides and Polyhalides 15.1.3 Hydrogen halides 15.1.2 The elemental substances 15.1.1 The halogens