Dmitri Mendeleev published the first periodic table in 1869. He showed that when the elements were ordered according to atomic weight, a pattern resulted where similar properties for elements recurred periodically. Based on the work of physicist Henry Moseley, the periodic table was reorganized on the basis of increasing atomic number rather than on atomic weight. The revised table could be used to predict the properties of elements that had yet to be discovered.

Many of these predictions were later substantiated through experimentation. This led to the formulation of the periodic law, which states that the chemical properties of the elements are dependent on their atomic numbers.

Elements in the periodic table are arranged in periods (rows) and groups (columns). Each of the seven periods is filled sequentially by atomic number. Groups include elements having the same electron configuration in their outer shell, which results in group elements sharing similar chemical properties.

This Book provides information of every element in the periodic table. Details of every element are listed in such a way so that every people reading this book can understand it.