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A periodic table may be defined as the table giving the arrangement of all the known elements according to their properties so that elements with similar properties fall with the same vertical column and elements with dissimilar properties are separated.
Periodic table helps us to undergo a systematic study of the various elements found in nature without which it would have been impossible for us to study all the elements. By classifying the elements into various groups and periods a comparative study of the elements and their compounds can be done. It also helps us to analyze the periodic trend in various properties such as ionization potential, electron affinity, electronegativity etc.