一前言每一个读过化学的人,即使读的是初级化学,都必定会晓得周期律,也必定会熟悉周期律的伟大发明人门得雷业夫。门得雷业夫是俄国的大化学家,虽然过去俄国的科学家与科学界,在资本主义国家中常受到歧视和排挤,俄国科学家的发明常被抹煞或盗,然而门得雷业夫毕竟羸得了国际声望。门得雷业夫发现了自然界的伟大定律——周期律,并以它为基础提出了他的天才预见,就是他语言未知元素的存在,对它们的性质作了多方面的介绍,并且还指出用什么方法可以找到他所预言的元素。在他的报告发表后不多久,他的天才预见果然得到了证实,因而使得全球的科学 Foreword Every man who has read chemistry, even if he is a student of primary chemistry, must know the periodic law, and must also be familiar with the great inventor of the periodic law, Dr. Dereyev. Dereyev, the great chemist in Russia, has often been denied or stolen the inventions of Russian scientists in the past despite the discrimination and exclusion of Russian scientists and the scientific community in capitalist countries in the past. However, International reputation. Dereyev discovered the great law of nature - the periodic law - and based it on his forethought of genius, the existence of unknown elements of his language, the various aspects of their nature, and the point What method can be used to find the elements he predicted. Shortly after his report was published, his genius foresight was confirmed, thus making the global science