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周期律是一个自然的客观规律。按照这个规律,我们能够把所有的化学元素归纳成有关的小组。在每一小组内,元素的性质和它无数化合物的性质,都严格地遵守按照原子序依次上增的顺序而逐渐地变化着。这就使得本来很复杂的物质世界有了科学的分类。无疑地,这对化学的发展是极关重要的。在周期律未发现以前,化学元素被看成是彼此没有关联的东西,化学研究只限于对无数零散的个别事实的无规律列举。自伟大的俄国化学家Д.И门德雷业夫用他超人的智慧发现了化学元素的周期律以后,才结束了化学上这种混乱的状态,使化学正式走上了科学的道路。周期律的化学研究上的指路明灯。它有力
Periodic law is a natural objective law. According to this law, we can put all the chemical elements into the relevant group. Within each subgroup, the nature of the element and the nature of its innumerable compounds progressively follow the order of increasing atomic order. This has led to the scientific classification of the very complex material world. Undoubtedly, this is crucial for the development of chemistry. Before periodic laws were discovered, chemical elements were considered as unrelated to each other, and chemical research was limited to an irregular list of countless scattered individual facts. Since the great Russian chemist Д.И Mendeleev discovered the periodicity of chemical elements with the wisdom of his superhumanists, this chaotic state of chemistry has ended and chemistry has officially taken the scientific road. The periodic law of chemical research on the beacon. It is powerful