Describe the merits and demerits of Mendeleev'
periodic table.
Answers
Answer:
There were many vacant spaces in Mendeleev's periodic table for the elements to be discovered. He named them Eka-Boron, Eka-Aluminium and Eka-silicone He also predicted the properties of these undiscovered elements including atomic masses. ... Mendeleev's arrangement helped to correct atomic masses of a number of elements.
Answer:
merits of mendeleev periodic table :
it is based on a more fundamental property of atomic weight of an element does it is better than earlier classifications.
some gaps were left knowledge in early by mendeleef for an discovered elements this accelerated the process of discovering this elements as their properties were predicted by mendeleev on the basis of other elements present in the same group.
it is pointed errors in atomic weight of a ready discovered elements which led to the correction of atomic weights.
demerits of mendeleev periodic table:
position of hydrogen : hydrogen is not given a definite position it is placed in group 1 b and group 7 b of mendeleev's original periodic table.
position of isotopes: mendeleev periodic table is silent about isotopes the position of various isotopes of the elements cannot be justified on the basis of atomic weight.
anomalous pairs : in mendeleev's periodic table the elements are arranged on the basis of their atomic weights however there are two such pairs in which atomic weights of reseeding elements is higher than that of the following elements.