一 核素的相对丰度十九世纪末期,基于地壳化学组成资料的积累,对自然界化学元素的相对丰度开始了较有系统的研究工作,试图获得某种类型的周期性和控制元素分布的一般规律,当时未获得预期的结果。但人们并未就此 Relative abundance of a nuclide In the late nineteenth century, based on the accumulation of crustal chemical composition data, relatively systematic studies on the relative abundance of chemical elements in nature began to attempt to obtain some type of periodic and controlled elemental distribution The general rule, then did not get the expected results. But people did not do that