<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> <Ul> <Li> The table was not able to predict the existence of the noble gases, but did, however, leave spaces for yet to be discovered elements to slot into . Time proved this audacious calculation correct . However, when this entire family of elements was discovered, William Ramsay was able to add them to the table as Group 0, without the basic concept of the periodic table being disturbed . </Li> <Li> A single position could not be assigned to hydrogen, which could be placed either in the alkali metals group, the halogens group or separately above the table between boron and carbon . </Li> <Li> The lanthanides were difficult to fit into the table . </Li> <Li> Polonium and radium, discovered by Marie Curie in 1898, also were difficult to fit into the table . </Li> </Ul> <Li> The table was not able to predict the existence of the noble gases, but did, however, leave spaces for yet to be discovered elements to slot into . Time proved this audacious calculation correct . However, when this entire family of elements was discovered, William Ramsay was able to add them to the table as Group 0, without the basic concept of the periodic table being disturbed . </Li>

Who arrange the elements in the periodic table