引言 Ⅳb族元素位于周期表的中部。这些元素,特别是可以生成成千上万种有机化合物的C,占有相当重要的地位。然而,从C到Si、Ge、Sn和Pb,尽管元素的化学特性随原子量的增加而逐渐发生变化,但后三种元素却有许多相似之处:它们可以形成各种氧化物和硫化物,也可以呈天然矿物产出。常见的碳的简单化合 Introduction Group IVb elements are located in the middle of the periodic table. These elements, in particular, can generate tens of thousands of organic compounds C, occupy a very important position. However, from C to Si, Ge, Sn and Pb, although the chemical properties of the element change gradually with increasing atomic weight, the latter three elements have many similarities: they can form various oxides and sulfides, Can also be natural mineral output. Simple combination of common carbon