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为什么自然界中许多元素的原子量近乎是整数,但又有些元素不像是整数?很久以前就有人提出这问题,虽则布特列洛夫曾经预言过:元素内部可能是不均匀的,但直到1898年居里夫人发现镭以前,是无人能够真正地回答的。紧随着镭,用同样的放射化学方法,也发现了铜(Ac)、射钍(RTh)和新钍(MTh),尤其在1907年发现了锾(Io)以后,证明锾和钍的化学性质完全相似,如果这两种元素的盐混和起来,那末即使用任何化学方法,再也不能把它们分离了。以后几年,德国的麦克华德与基特门(Marckwald ＆ Keet-man)用最灵敏的放射化学方法,奥国的威斯巴赫
Why do many elements in nature have atomic weights that are almost integers, but others that are not integers? Someone raised the question long ago, though Boutroref once predicted that elements may be inhomogeneous inside, but until 1898 Before Marie Curie discovered radium, no one could really answer it. Following the radium, copper (Ac), radioactive thorium (RTh) and new thorium (MTh) were also found by the same radiochemical methods, especially after the discovery of 锾 (Io) in 1907, demonstrating the chemistry of 锾 and thorium The nature is very similar. If the salts of these two elements are mixed together, they can no longer be separated by any chemical method. In the next few years, Germany’s McKard and Keet-man used the most sensitive radiochemical methods, the Wiesbaden