THE periodic table on the WWW [

Copyright 1993-2018 Mark Winter [University of Sheffield and WebElements Corporation, UK]. Copyright

Elements are summarized in a special chart called periodic table. A simple periodic table is shown in Figure 3.2 "Simple periodic table", and a wider periodic table is shown in Chapter 17 "Appendix: Periodic Table of Elements". The elements of the periodic table are listed in ascending numerical order. The periodic table has a special form which is important for us when considering the electronic structure in atoms (see Chapter 8 "Electronic structure"). Use of the periodic table helps to quickly discriminate between metals and non-metals. The nonmetal is in the upper right corner of the periodic table, and the right side of the graph is divided on one side of the thick line. All other elements are metal

Another long form of element periodic table is proposed. The earliest ones described by Aer Werner in 1905 divide each shorter period into two parts at the end of the table for those most similar longer period elements. Therefore, a plurality of connecting lines connecting the periods of the bailey type table are omitted. This type of table can also be greatly simplified by deleting the elements of the lanthanide and act system in separate areas. By the middle of the 20th century, this version of the table (Figure 1) is now most commonly used

2 History of the Periodic Table Mendeleev places the elements in the world's first periodic table and Mendeleev increases the atomic number and increases atomic weight by comparing the number of mutually reactive elements to the world's first periodic table Place elements in. Quality by comparing the number of elements that react with each other 3 The modern periodic table is different from the Mendeleev table - he does not know that protons and electrons are different from the Mendeleev table - he knows that protons and electrons I do not know to increase the number of atoms. Mass proton number Proton number Electron number Electronic number It is not mass increasing atom number than electron number

Please look carefully at periodic table A. The history of the boundary table Mendeleev arranged these elements in the world's first periodic table, Mendeleev arranged