![]() Lower down, however, amongst the rare earth metals, it was a bit of a mess. New elements had indeed been discovered and the top of the table looked fairly complete. Thanks to Mendeleev’s inspired guess that there were more elements to discover, his Periodic Table had become an accepted and useful tool for chemists. He had started with a list of the known elements in order of the atomic weights – what we now call Relative Atomic Mass. Fifty years had passed since Mendeleev had designed his Periodic Table. What determines the order of the elements in the Periodic Table? How do we know how many elements there are? The first we shall explore is Henry Moseley’s work on atomic number. A number of important ideas were developed during that one year that are important in the chemistry learned in school today. Anniversaries of chemical discoveries are celebrated every year, but the centenary of 1913 is quite special.
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