Question

what is perodic table and why it is constructed ?​

Answer 1

Answer:

Russian chemist Dmitri Mendeleev published a periodic table in 1869, which he developed mainly to illustrate recurring trends among the properties of the then-known elements. He was the first to predict some properties of unidentified elements that were expected to fill gaps within the table.

Answer 2

Answer:

heya!!ur answer is this

Explanation:

Russian chemist Dmitri Mendeleev published a periodic table in 1869, which he developed mainly to illustrate recurring trends among the properties of the then-known elements. He was the first to predict some properties of unidentified elements that were expected to fill gaps within the table.

Most of his forecasts proved to be correct, culminating with the discovery of gallium and germanium in 1875 and 1886 respectively, which corroborated his predictions.[2] Mendeleev's idea has been slowly expanded and refined with the discovery or synthesis of further new elements and the development of new theoretical models to explain chemical behaviour.

The table here shows a widely used layout. Other forms (discussed below) show different structures in detail. Some questions remain as to the placement and categorisation of specific elements, future extensions and limits of the table, and whether there is an optimal form of table.

The seven rows of the table, called periods, generally have metals on the left and nonmetals on the right. The columns, called groups, contain elements with similar chemical behaviours. Six groups have accepted names as well as assigned numbers: for example, group 17 elements are the halogens; and group 18 are the noble gases. Also displayed are four simple rectangular areas or blocks associated with the filling of different atomic orbitals. The organization of the periodic table can be used to derive relationships between the properties of the various elements, and to predict chemical properties and behaviours of undiscovered or newly synthesized elements.

HOPE ITS HELPFUL