Chemical Elements

Iron atoms in human blood were synthesized in the depths of stars, solid hydrogen is the lightest solid substance, and 3500 proteins are formed in one cell. Indigo and kermes were used in Ancient China 4000 years B.C., and copper was used in Egypt. There are 7 periods, 18 groups, and 118 elements in the periodic table, which are known to make up everything in the world. The biographies and characteristics of chemical elements were described by Ilya Abramovich Leenson (1945-2019) - a candidate of chemical sciences, former senior researcher at the chemistry faculty of Moscow State University, associate professor at the Higher Chemical College of the Russian Academy of Sciences, author of scientific and popular science articles, books, and textbooks.