Wednesday, 21 January 2015

Perodic Table of The Elements

Perodic table

The periodic table of the elements (or simply the periodic table) is the pattern with which the chemical elements are ranked based on their atomic number Z and the number of electrons present in the orbital higher atomic energy.

The periodic table of elements is designed by the Russian chemist Dmitri Mendeleev [1] in 1869, simultaneously and independently by the German chemist Julius Lothar Meyer (1830-1895), [2] initially had many empty spaces, provided for items that would be discovered in the future, some in the second half of the twentieth century.

The periodic table of Mendeleev, which is the first version and also the currently most widely used, is the periodic table by definition, so in the ongoing discussion of talking about "periodic table" will be referred to the periodic table of Mendeleev, except where it is explicitly stated otherwise.