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First element was discovered.
In 1649, the first element (phosphorous (P) was discovered through scientific inquiry by Hennig Brand. -
Period: to
Johann Dobereiner began to group elements.
Between the years 1817-1829, Johann Dobereiner began to group elements that have similar properties in to groups of three or triads. It began in 1817 when he noticed that the atomic weights of strontium, Sr, was halfway between the weights of calcium and barium. -
First Attempts At Designing a Periodic Table
If a periodic table is regarded as an ordering of the chemical elements demonstrating the periodicity of chemical and physical properties, credit for the first periodic table (published in 1862) probably should be given to a French geologist, A.E.Beguyer de Chancourtois. -
The first person to make use atomic weights.
In 1862, A.E.Beguyer de Chancourtois was the first person to make use of atomic weights to reveal that the elements were arranged according to their atomic weights with similar elements occurring at regular intervals. He drew the elements continuous in a spiral around a clylinder in 16 parts. -
63 Elements had been discovered.
63 elements had been discovered. -
The history of the periodic table
The history of the periodic table reflects over a century of growth in the understanding of chemical properties, and culminates with the publication of the first periodic table by Dmitri Mendeleev in 1869. -
Independently produced simarlar versions of the periodid table.
Lothar Meyer and Dmitri Ivanovich Mendeleev independently produced remarkably similar versions of the periodic table of elements at the essentially the same time. -
The Modern Periodic Table
The last major changes to the periodic table resulted from Glenn Seaborg's work in the middle of the 20th Century. Starting with his discovery of plutonium in 1940, he discovered all the transuranic elements from 94 to 102.