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Write any two limittation of mandleev …

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Write any two limittation of mandleev periodic law ?

    • Posted by Gaurav Nawariya 5 years, 6 months ago

    CBSE > Class 08 > Science
    • 1 answers

    Meghna Thapar 5 years, 6 months ago

    • Limitations of Mendeleev’s Periodic Table:
    1. Hydrogen resembles alkali metals as well as halogens. So, a correct position could not be assigned to hydrogen in the periodic table.
    2. The position of isotopes could not be explained.  Isotopes  are  atoms  of  the  same  element  having similar  chemical  properties  but  different  atomic  masses.  If the elements are arranged according to atomic masses, the isotopes should be placed in different groups of the periodic table.
    3. At  certain  places,  an  element  of  higher  atomic  mass was placed  before  an  element  of  lower  atomic mass. For example: Cobalt (Co = 58.93) was placed before nickel (Ni =58.71).
    4. Some elements placed in the same sub group had different properties. For example: Manganese is placed with the halogens which are totally different in their properties.

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