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Main difference between Mosley's and Mendeleev's periodic tables?

 Mendeleev's perhaps greatest achievement was his arrangement of the chemical elements into an easy-to-use format. He grouped the 63 known elements into periods and groups by atomic mass. Mendeleev noticed holes in the table and so predicted the existence and properties of undiscovered elements. A notable exclusion from his table was the noble gases, which also had not been discovered.
 Moseley was the catalyst for the periodic law, a rule stating that the properties of elements are a periodic function of their atomic numbers. Using the atomic numbers, Moseley was able to more accurately position the elements in the periodic table. Moseley's change to the periodic table allowed the few problems with Mendeleev's periodic table to disappear. The modern periodic table is now based on atomic numbers.


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