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Information about Modern Periodic Table and its advantages

Posted Date: 20 May 2018 |Updated: 20-May-2018 |Category: Chemistry Projects |Author: Hakimuddin Kuwakhedawala |Member Level: Gold |Points: 45 |

This article will provide you with the information of modern periodic table. You will find the modern periodic law. You will also find the importance of modern periodic table. To know about the modern periodic table, please read this article.

Introduction

In 1911, Moseley discovered atomic number. According to him, PHYSICAL and CHEMICAL properties of elements do not depend upon atomic weight but on atomic number, that is the number of protons and atomic number is the basic properties of elements and not atomic mass. Therefore, Moseley considered atomic number as the basis of classification and not the atomic weight. Moseley proposed the modern periodic law according to which the physical and chemical properties of elements are the periodic functions of their atomic numbers. It means that when elements are placed in increasing order of their atomic number then after regular interval elements of same properties are repeated.

Mendeleev's periodic table was based on atomic masses while in Modern periodic table elements were arranged in the order of increasing atomic numbers in seven horizontal rows (period) and 18 vertical columns (groups). Elements of a group possess SIMILAR valence shell electronic configuration hence they exhibit similar chemical properties.

Study of the electronic configuration of different elements revealed that there is a close relationship between the electronic configuration of elements and their properties. On placing elements in increasing order of their atomic number, elements of the same configuration appear after regular intervals. As a RESULT of which elements of similar properties also appear after regular intervals. Hence periodicity in the properties of elements at a regular interval of atomic number is due to the REPETITION of similar valence shell electronic configuration.

Considering electronic configuration of elements Werner, Bury, Rang, etc. proposed modern periodic table or long form or extended form of periodic table. This table is also called Bohr's periodic table since Bohr, first of all, described the arrangement of electrons round the nucleus of an atom. please give me thanks