Periodic Table of History



Approx. 1789

Antoine Lavoisier formulated a text called Traité Élémentaire de Chimie or simply The Elementary Treatise Of Chemistry which contained 33 'Simple Substances' which are now called elements. These substances however were only classified into Metals and Non Metals leaving a lack of complete info limiting usefulness.


Approx. 1817

Johann Wolfgang Döbereiner formulated the idea that elements could be sorted into groups of three, this concept was not finished until 1928 when the Book of Elemental triads was created.



It was in 1864 that John Newlands first organised the elements into an order based on atomic weight and using this to find similarities and shared characteristics between them.


March 6 1869

On this day Dimitri Ivanovich Mendeleev gave his first formal presentation of a periodic table he had been working on for 5 years. It involved sorting into electron shells as well as chemical properties. This genius layout of the table even allowed Mendeleev to make predictions about where elements were missing accurately e.g scandium, silicon and galium.



Henry Moseley as a successful English Physicist who first purposed the idea of placing elements in order of likeness without relying on atomic weight. He did this by analysing some elements under an x-ray and played argon before Potassium



Glenn Seaborg was a chemist who noticed an issue in isolating certain elements, this led him to believe there could be a new subsection. Thus he made a large adjustment to Mendeleev's table and created the Actinides and Lathanides all in the f subshell.