what are demerits of Mendeleev periodic table
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Demerits of Mandeleev periodic table are↓↓↓
a) Position of Hydrogen:
Position of hydrogen in the periodic table is uncertain. It has been placed in 1A group with alkali metals, but certain properties of hydrogen resemble those of halogens. So, it may be placed in the group of halogens as well.
b) Position of Isotopes:
Isotopes are the atoms of the same element having different atomic masses. Therefore, according to Mandeleev's classification these should be placed at different places depending upon their atomic masses.
c) Anomalous pairs of element:
In certain pair of elements, the increasing order of atomic masses was not obeyed. In these, Mandeleev placed elements according to similarities in their properties and not in increasing order of atomic masses.
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