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your question does not make sense. your question does not make sense.
Arsenic did not create the first periodic table. The first periodic table was created by Dmitri Mendeleev, a Russian chemist, in the 1860s. Other scientists had organized elements in other ways prior to the invention of Mendeleev's periodic table, but the other methods were criticized and did not catch on.
Mendeleev developed the first periodic table and Mosely later modernized it.
Mendeleev placed his elements in order of increasing atomic mass. He placed elements with similar chemical properties in the same groups or families. He realized that there were some gaps in the table where an undiscovered element should go and made predictions about those elements before they were found.
Cleveland.
Mendeleev, a Russian chemist, organized the periodic table in order of relative atomic mass. He realized that the physical and chemical properties of chemicals were related to their atomic mass, and arranged them in a way so that groups of elements with similar properties fell into vertical columns (groups) with each period's elements having incrementally greater mass than the masses of the elements in the periods above it.According to Mendeleev, he had a dream about the elements falling into place on a table. His work was partly based on the work of Anton Lavoisier, who discovered the role of oxygenin combustion, and gave the element its modern name.
Mendeleev organized the elements according to their increasing atomic masses and considered their fundamental properties . He also considered the Hydrides and Oxides formed by the elements.
The periodic table is from 1869.
Mendeleev created the periodic table of elements. At his time, there was no grouping for the elements. He figured out that they can be grouped by mass and physical properties His result was so good that it correctly predicted elements that were not discovered yet.
he ordered the elements based on what they're made of.
He organized it according to the atomic mass.
Dmitri Mendeleev was the first scientist to create the periodic table
Because he was creating a book called the Principle of Chemistry and he noticed the pattern in every elment. So he made a table or (chart) called Periodic Table of Elements.
On 6 March 1869, Mendeleev made a formal presentation to the Russian Chemical Society, entitled The Dependence between the Properties of the Atomic Weights of the Elements, which described elements according to both atomic weight and valence.
maybe as only 10 or 15 had been discovered by 1750
your question does not make sense. your question does not make sense.