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［知识要点］ １．卤素的原子结构和单质的物理性质（略） ２ 卤素单质的化学性质 Ｘ_2是活泼的非金属单质，易得电子表现出强氧化性：Ｘ_2＋２ｅ＝２Ｘ～－．但氧化性最强的是Ｆ_2，最弱的是Ｉ_2即活泼性（或氧化性）： Ｆ_2＞Ｃｌ_２＞Ｂｒ_2＞Ｉ_2 与金属反应：多为燃烧反应
[Knowledge points] 1. The atomic structure of halogen and the physical properties of simple substance (abbreviated) 2 The chemical properties of halogen simple substance X 2 is an active non-metallic simple substance, and the easily-obtained electron exhibits strong oxidizing property: X_2+2e=2X~-. However, the most oxidizing property is F 2 , and the weakest is I 2 ie active (or oxidizing): F 2>Cl 2>Br 2>I 2 reacting with metals: mostly combustion reaction