Halogen
例子
Chlorine is a halogen commonly used in water treatment for its disinfectant properties.
氯是一种卤素,因其消毒特性而常用于水处理。
Fluorine, a highly reactive halogen, is often added to drinking water to promote dental health.
氟是一种高活性的卤素,常被添加到饮用水中以促进牙齿健康。



























