The periodic table shows all the known elements in order of atomic number. Even though the elements listed on the periodic table haven't changed themselves the periodic table has. By 1869 a total of 63 elements had been discovered, and were arranged according to their properties and gaps were left where elements were thought to be missing. The scientist Dimitri Mendeleev was the first to publish a periodic table.
Though the 1869 periodic table looks drstically different than the current day periodic table the elements each have their atomic number and "?" are left where there are elements missing. As more elements were discovered in the 20th century the periodic table became more refined to what it is today.
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