Please say what is merits and demirits of mendeeleev
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Merits of Mendeleev Periodic Table. Some gaps were left for the elements yet to be discovered. Thus, if a certain new element is discovered, it can be placed in a new group without disturbing any existing group
demerit of Mendeleev periodic tables Mendeleev could not assign a correct position to hydrogen in the periodic table as hydrogen resembles alkali as well as halogen isotopes of the same element. have different atomic muscle tense. each of them should have been placed. at a different position in the periodic.
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