 | The Halogens卤族元素
The elements of Group VII of the Periodic Table are called halogens, which means "salt formers". They lack only one electron to form a complete shell or subshell, and are extremely active chemically. Chemical activity increases as you move upward in the group, fluorine being the most active element in the Periodic Table. 元素周期表中第VII组的元素称为卤族元素，意为‘盐形成者’。它们缺少一个电子即可形成完整的壳层或亚壳层，并且在化学上非常活泼。随着在族中的向上移动，化学活性增加，氟是周期表中最活泼的元素。
At room temperature, fluorine and chlorine are gases, bromine is liquid, and iodine is solid. They form diatomic molecules in the pure state. The halogens are poisonous, and chlorine gas and chlorine compounds have been used as chemical weapons. In small concentrations, chlorine is used to disinfect drinking water and to disinfect swimming pools. 在室温下，氟和氯是气体，溴是液体，碘是固体。它们在纯态下形成双原子分子。卤素是有毒的，氯气和氯化合物曾被用作化学武器。在低浓度下，氯被用于消毒饮用水和游泳池消毒。
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| Chemistry of the Elements
元素的化学 |
Periodic Table
Chemistry concepts
索引 元素周期表 化学概念
| HyperPhysics | R Nave |
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