Science: History of The Periodic Table

Four hundred years ago, scientists began to identify the substances currently considered elements. As the number of known elements increases, they begin to identify patterns in the attributes and lead to the beginning of the classification scheme. It will design the periodic table ("periodic table", nd) in the way we know today. In 1789, French chemist Antoine - Roland Labo Wadjie (1743 - 93) used light (now known as a nonexistent element) and a liquid called "calories" (what does not exist at the moment) We isolated 33 substances that we thought included (chemical substances) Heritage Foundation, nd) - Metals, nonmetals and "the earth" (Linstead, 2012, p. 129).

The story of a normal system for classifying elements dates back more than 200 years ago. Within its long history, the periodic table has been controversial, changed, and refined by the development of science and the discovery of new elements. However, despite the dramatic change in science in the past century - the development of relativity and quantum mechanics - the fundamental nature of the periodic system has not changed. In some cases, the first new discovery seems to question the theoretical basis of the periodic table, but each time the scientist attempts to merge while preserving the basic structure of the table. It is worth noting that the periodic table of elements attracts a great deal of attention from its historical root and modern relevance.

2 History of the Periodic Table Mendeleev places the elements in the world's first periodic table, Mendeleev puts the elements in the world's first periodic table, compares the number of elements that react with each other, increases the atomic weight, I will increase it. Modern periodic table is different from Mendeleev table - he does not know that protons and electrons are different from Mendeleev table - he does not understand that protons and electrons increase the number of atoms Mass proton number proton number It is not a mass increasing atom number than an electron number electron number

Please watch the periodic table A carefully. The history of the periodic table Mendeleev arranged these elements in the world's first periodic table and Mendeleev arranged this element.