八行周期律当元素按原子量增加的顺序排列成以八个为一组时则上下每组对应元素有相似的性质
The eight-line periodic law states that when elements are arranged in groups of eight in the order of increasing atomic weight, the corresponding elements in each group have similar properties
以上为机器翻译结果，长、整句建议使用 人工翻译 。