Essay on Modern Periodic Table Classification System

Essay on Modern Periodic Table Classification System

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Chemists have always looked for a way to arrange the elements to reflect their properties and similarities. The modern periodic table lists the elements in order of increasing atomic number, but it wasn’t always like this. First the table was ordered by atomic masses. This was due to the lacking knowledge of sub-atomic particles. The creation of the modern periodic table took several differents ideas to finally arrive at what it is today.
The most recognized person for discovering the periodic table is Dmitri Mendeleev. But several other chemists should be credited just as much. I’m going to take you down through the creation of the table as scientists and discoveries progress.
A French geology teacher made a significant step towards a table in 1862. Alexandre Beguyer de Chancourtois came up with the “vis tellurique”, or telluric screw. This was three-dimensional arrangement of the elements constituting an early form of the periodic table classification system.
John Newlands, a British man who worked to study organic chemistry, noticed similarities between elements with atomic weights that differ by seven. He called this The Law of Octaves. He arranged the elements in an order by similarities, but did not have the Noble Gases or any undiscovered elements of the time. He often had to cram two elements into one box and sometimes left one out. For these reasons his works were denied publishing.
Julius Lothar Meyer studied at the same university as Mendeleev at the same time. He produced several periodic tables from 1864 to 1870. His first table contained 28 elements. These consisting mainly of the main group, but in 1868 he included the metals in a much more developed table. This table listed elements in order of atomic weig...


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... explained further why Moseley’s X-rays corresponded so well with atomic number. The idea behind the explanation is that when an electron falls from a higher energy level to a lower one, the energy is released as electromagnetic waves, in this case X-rays. The amount of energy that is given out depends on how strongly the electrons are attracted to the nucleus. The more protons an atom has in its nucleus, the more strongly the electrons will be attracted and the more energy will be given out. As we know, atomic number is also known as proton number, and it is the amount of protons that determine the energy of the X-rays.
After so many years of searching, the world finally had a periodic table that really worked. The same periodic table we use today was actually made up from several different points of several different scientists and has stood the test of time.

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