Who made the periodic table?

The periodic table was made by the effort of many scientists, chemists and physicists worldwide over a time period of many decades. It was made in order to arrange the elements in accordance with their chemical and physical properties.

It was Dmitri Mendeleev, in 1869, who made the periodic table we use today. His periodic table was the first one that was appropriate enough to be accepted as the official periodic table at that time. The arrangement of elements in it was such that it even allowed Mendeleev to predict the existence of yet undiscovered elements at that time, like putting the parts of a jigsaw puzzle together.

There was, however, a major anomaly in his periodic table, and that was the placement of isotopes. Isotopes are the atoms of the same element that have same atomic numbers but different atomic masses. Since Mendeleev's periodic table was arranged in increasing order of the atomic masses of elements, therefore the positioning of isotopes became a major issue in it. This defect was corrected in 1920 by Henry Moseley, who rearranged Mendeleev's periodic table by ordering the elements in increasing order of their atomic numbers rather than their atomic masses. Since isotopes have same atomic numbers, this periodic table did not have any fall-backs.

Thus, the current long form of the periodic table was established in 1920, but the credit of invention goes to Dmitri Mendeleev, since he was the one who made the basic structure of the current periodic table.

Other notable attempts to make the periodic table were of John Newland (in 1864/1865) and Doberiener (in 1829) in the Law of Octaves and the Law of Triads.