The changes that proposed to Mendeleev's original periodic table is that the periodicity of the elements should depend on atomic number rather than atomic weight and another group of elements should be added to the periodic table.
The Mendeleev periodic table arranged the elements in order of increasing atomic weights. In his table,he left spaces for yet to be discovered elements. He proposed the discovery of yet to be discovered elements .
However, Mendeleev did not initially include Argon in his classification of elements because it was completely inert. However, with the confirmation that it is indeed an element a new group of elements had to be created.
Also, since argon's atomic weight is greater than Potassium, thus the periodicity of the elements should depend on atomic number rather than atomic weight.
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