Chemical Elements

The atoms of iron 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. In 4000 B.C. in Ancient China, indigo and kermes were used,... and in Egypt - copper. The periodic table has 7 periods, 18 groups, and 118 elements, of which, as is known, everything in the world is made. The biographies and characteristics of chemical elements were described by Ilya Abramovich Leenson 1945-2019 - candidate of chemical sciences, former senior researcher at the chemical 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 teaching aids.