Some Representative Groups and Families 一些有代表性的元素族
Sulfur Family(S族)
Sulfuric Acid(硫酸)
Other Important Compounds of Sulfur(S元素的其他重要化合物)
Halogen Family(卤素)
Some important Halides and Their Uses(一些重要的卤化物及其应用)
Nitrogen Family(氮族)
Nitric Acid(硝酸)
Other Important Compounds of Nitrogen(N元素的其他重要化合物)
Other Members of the Nitrogen Family(N族的其他区成员)
Metals(金属)
Properties of Metals(金属性质)
Some Important Reduction Methods(一些重要的还原方法)
Alloys(铝)
Metalloids(非金属)
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