Write Demerits of mendeleev's periodic tabke
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Demerits of Mendeleev's Periodic Table :
(a) Mendeleev arranged elements in the ascending order of their atomic masses. There was no fixed position for hydrogen in his periodic table, as it resembled alkali metals as well as halogens.
(b) Elements of higher atomic mass were placed before elements of lower atomic mass. Cobalt with atomic mass 58.93 was placed before nickel with atomic mass 58.71.
(c) Elements having different properties were placed in the same sub group like manganese (Mn) was placed with halogens which had totally different properties
Explanation:
Answer:
demerits of Mendeleev periodic table are:-
- position of isotopes could not be explained.
- no fixed position for hydrogen .
- wrong order of atomic masses of some elements could not be explained.
-Position of hydrogen - he couldn't assign a correct position to hydrogen as it showed properties of both alkali and halogens .
-Position of isotopes - he considered that the properties of elements are a function of their atomic masses. Hence isotopes of a same element couldn't be placed.
-In the d-block , elements with lower atomic number were placed before higher atomic number.
-Lanthanoids and actinoinds couldn't be assigned any location.
-There was no space for inert gases.
-Various non metals were placed with the metals in the periodic table
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