精选优质文档-倾情为你奉上Lesson1Beginning in the late seventeenth century with the work of Robert Bayle, who proposed the presently acceptable concept of an element, numerous investigations produced a considerable knowledge of the properties of elements and their compounds.早在17世纪末期，RB就开始了这项工作，他提出了现在公认的元素概念，大量的研究使我们对元素及其化合物的性质有了相当的了解。Thus it is possible to arrange the list of elements in tabular form with elements having simliliar properties placed in vertical columes.于是，将具有类似性质的元素排成纵列，从而把元素
