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Demerits of Mendeleev’s Periodic Table

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LIMITATIONS OF MENDELEEVS CLASSIFICATION:-

  • No fixed position can be given to hydrogen in the Periodic table.
  • Isotopes were discovered long after Mendeléev had proposed his periodic classification of elements. Position of isotopes could not be explained.
  • Another problem was that the atomic masses do not increase in a regular manner in going from one element to the next. So it was not possible to predict how many elements could be discovered between two elements.
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