Table Periodically

In 330 BC a Greek philosopher named aristotle proposed the idea of the four element theory that all materials were made up of: earth, air, fire, and water. Then a little later in 440 BC two philosophers, Democritus and Leucippus advocated the idea of the atom: an indivisible particle that all matter is made of.
Robert Boyle published the “The Sceptical Chymist” in 1661 which was a treatise on the distinction between chemistry and alchemy. It also contained some of the earliest ideas of atoms, molecules, and chemical reactions marking the beginning of the history of modern chemistry.
There were a couple of trial and error tables made before the final one. Jakob Berzelius develop a table of atomic weights and introduced letters to symbolize the elements in 1828. A little later Lothar Meyer developed an early version of the periodic table, with 28 elements arranged by valence.
The final copy of the periodic table was published by Dmitrii Mendeleev in 1864 when he decided to produce a table based on atomic weights, arranged 'periodically' with elements with similar properties placed under each other. His Periodic Table included the 66 known elements organized by atomic weights.
Currently there are 118 elements on the periodic table, and they can be classified into four different groups; metals, nonmetals, noble/inert gases, and metalloids.

There are 7 periods and 18 groups that make up the tables organization. The periods run left from right horizontally and all of these elements have the same number of electron shells. However the groups classify elements that have similar properties.

Elements 1 through 92 (except for elements 43 and 61) occur naturally on Earth, although some are only present in extremely small quantities.
Created By
Tyler Wells


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