<Li> Polonium and radium, discovered by Marie Curie in 1898, also were difficult to fit into the table . </Li> <P> Unknown to Mendeleev, a German chemist, Lothar Meyer, was also working on a periodic table . Although his work was published in 1864, and was done independently of Mendeleev, few historians regard him as an equal co-creator of the periodic table . Meyer's table only included twenty - eight elements, which were not classified by atomic weight, but by valence, and he never reached the idea of predicting new elements and correcting atomic weights . A few months after Mendeleev published his periodic table of the known elements, predicted new elements to help complete his table and corrected the atomic weights of some of the elements, Meyer published a virtually identical periodic table . </P> <P> Meyer and Mendeleev are considered by some historians of science to be the co-creators of the periodic table, but Mendeleev's accurate prediction of the qualities of undiscovered elements enables him to have the larger share of the credit . </P> <P> In 1864, the English chemist William Odling also drew up a table that was remarkably similar to the table produced by Mendeleev . Odling overcame the tellurium - iodine problem and even managed to get thallium, lead, mercury and platinum into the right groups, which is something that Mendeleev failed to do at his first attempt . Odling failed to achieve recognition, however, since it is suspected that he, as Secretary of the Chemical Society of London, was instrumental in discrediting Newlands' earlier work on the periodic table . </P>

Who developed the periodic table we use today
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