The Periodic Table of the Elements is a table that displays the list of chemical elements which are organized based on their properties. They are listed in increasing atomic number; while rectangular in general outline, gaps are included in the rows or periods to keep elements into groups with similar properties. Examples of these are the halogens and the noble gases, which are kept together in columns or groups, creating distinct, rectangular areas or blocks. The table is greatly widely used in chemistry due to containing the properties of many elements and their relations between different properties. It provides a basis for analyzing chemicals and the behavior, as well as in other sciences.