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一、知识归纳1.物质的组成(1)从宏观上讲,物质是由元素组成的.元素在自然界以游离态和化合态两种形式存在,以单质形式存在的称为元素的游离态,以化合物形式存在的称为元素的化合态.(2)从微观上讲,物质是由原子、分子或离子构成的.原子晶体(如金刚石、硅、硼等少数非金属单质和SiO 2、SiC、BN等少数非金属化合物)是由原子构成的,分子晶体(多数非金属单质、非金属氢化物、多数非金属氧化物、多数有机物)是由分子构成的,离子晶体(多数盐、活泼金属的氧化物和过氧化物、强
First, the knowledge induction 1. The composition of matter (1) From the macroscopic point of view, the material is composed of elements.Organic elements in the free state and the state of the two forms exist in the form of elements that exist as elements of the free state, the compound (2) Microscopically, matter is made up of atoms, molecules or ions. Atomic crystals (such as diamond, silicon, boron and a few other non-metallic elements and SiO2, SiC, BN Etc.) are made up of atoms. Molecular crystals (most of the non-metallic elements, non-metallic hydrides, most non-metallic oxides, and most of the organic compounds) are composed of molecules. Ion crystals (most salts, oxidation of active metals Matter and peroxide, strong