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1.从前面所学的知识可知,纯净物组成是固定不变的,每一种纯净物组成的化学式只有一个,即形成化合物的元素有固定的原子个数比.例如: 化学上用“化合价”来表示原子之间相互化合的数目.如:在2Na+Cl_2=2NaCl 反应中,反应物的钠原子与氯原子的个数比总是1:1.这是因为在化学反应中,元素的原子最外电子层总是要趋于八个电子的稳定结构,即元素的原子会得到或失去一定数目的最外
1. From what we have learned in the past, the composition of pure material is fixed, and there is only one chemical formula for each type of pure material, that is, the number of elements forming a compound has a fixed atomic ratio. For example: Chemically used The valence " to represent the number of mutual compounding between atoms. For example: in the reaction of 2Na + Cl2 = 2NaCl, the ratio of the number of sodium atoms of the reactants to the number of chlorine atoms is always 1:1. This is because in the chemical reaction, The atomic outermost electron layer of an element always tends to have a stable structure of eight electrons, that is, the atoms of the element get or lose a certain number of the outermost