Question

demerit of Mendel's periodic table??​

Answer 1

Answer:

The demerits of mendeleev periodic table are:

He is unable to define the place of hydrogen in his periodic table

Answer 2

Answer:

• Position of hydrogen : H resembles both, the alkali metals and the halogen.

• Position of isotopes : As atomic weight of isotopes differs. There were no different place for isotopes in table.

• Anomalous pairs of elements : There were some pair of elements which did not follow the increasing order of atomic weight.

• Like elements were placed in different groups : There were some elements like platinum (Pt) and Gold (Au) which have similar properties but were placed in different groups in his table.