by Renee Gallman-Jones

Created on: June 05, 2008   Last Updated: June 21, 2008

The Periodic Table Explained

The periodic table is familiar to most people, but why was it created and what does it mean? If you have taken a chemistry class, you may be familiar with the periodic table and the elements contain therein. This research will provide the reader with a brief history of the origin of the periodic table and an explanation of why it is designed the way that it is.

Imagine having a collection of butterflies, how would you keep track of the different species, identify where they originated from, or recognize how many are the same color? Generally, you would classify and group the like butterflies in order to keep track. Well the periodic table is chemistry's method of categorizing and classifying similar elements. (Curran, 2008)

At first it may be necessary to learn how the table became known as The Periodic Table. Examining the organization of the table will show us that elements are arranged in a manner which is predictable and based on properties, periodically, thus the name Periodic Table. Over one hundred elements can be found on the table and they are listed in a sequence of seven rows and eighteen columns, the columns are classified as families and the rows are identified as a period. (National Science Digital Library, 2008)

The table was first created in 1817 by Johann Dobereiner, a German Chemist; he first noticed similarities between elements and their properties. He tagged is finding as a "triad" since it was mainly three elements in each group that had similar properties. An English Chemist John Newlands was responsible for the first update to the periodic table some fifty years after Dobereiner. Newlands identified that forty-nine well known elements would repeat the eight element when grouped by their atomic masses. Newlands coined his grouping of elements as "law of octaves" and arranged them in clusters of seven. (National Science Digital Library, 2008)

A third attempt at positioning the elements on the periodic table was done in 1860 by Lothar Meyer another German chemist. Lothar determined that if elements were grouped by their atomic mass particular properties would be repeated periodically. Shortly thereafter in 1869 a Russian Chemist Dimitri Mendeleev printed the first periodic table, leaving blank spaces for unknown elements while grouping the other elements into eight columns. His foresight was proven to be correct as other elements were later added to the table. (American Institute of Physics, 2008)

In 1914 after

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