MODERN PERIODIC TABLE vs MENDELEEV'S PERIODIC TABLE
The elements are arranged in grids. The elements are arranged as a list.
The elements are arranged according to their The elements are arranged according to their
increasing atomic number. increasing atomic masses.
Transition metals are placed in different block. Transition metals were placed in groups with non-transition metals
Empty spaces for undiscovered elements were Empty spaces were left for undiscovered
filled. metals
Cause of periodicity is given. Cause of periodic table is not given.
(electronic configuration)
Position of isotopes is logically explained. Position of isotopes is not correct according to Mendeleev's law of atomic masses.
source-modern abc of chemistry(book)
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