The periodic table of the elements

The Periodic Table of the Elements is a sequence of chemical elements classified by atomic number, and clarifies periodic characteristics (chemical periodicity) of elements.

The standard format of the periodic table shown here has period (horizontal display) and group (vertical display). The attributes of the elements in a group are similar to each other in several respects

The Periodic Table has no single or best structure, but the format used here is very useful and most common. The Periodic Table of the Elements is a masterpiece of organized chemical information and the cycle of chemical elements to the present form is an amazing achievement.

Element is your basic chemical constituent. They contain hydrogen, oxygen, sodium, magnesium, iron, titanium and other elements and are anything in the periodic table. Each element in the periodic table has a different number of protons in its nucleus (dense center). There are several types of each element, the number of protons is the same, but the number of neutrons in the nucleus is different. All isotopes of a particular element are chemically identical to each other. The element period table is shown in Fig. Each listed element has many (2 to 20 +) isotopes

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

In the Periodic Table of the Elements, in the chemical order, the order of all chemical elements in ascending order of atomic numbers - the total number of protons in the nucleus. When chemical elements are arranged in this way, their characteristics have a repeating pattern called "periodic law", and the elements in the same column (group) have similar characteristics. (See Figure 1.) The first discovery was proposed by Dmitry I. Mendeleyev in the mid-19th century and is very valuable in the development of chemistry.