There were many scientific discoveries led to the revision of mendeleev's periodic table.
- Beyond Mendeleev's original 63 elements, periodic charts today more elements are included. The majority of the elements in the present periodic tables number 108 or 109.
- Today's tables have rows that display elements in Mendeleev's column order. In other words, Mendeleev listed the components of what we now refer to as a "period" vertically. In contrast to Mendeleev's table, where chemical "groups" were displayed horizontally, they are now displayed vertically.
- Mendeleev's arrangement was based on the atomic ratios at which elements produced oxides, binary compounds with oxygen, whereas modern periodic tables are organised in increasing order of atomic numbers.
- Discoveries of isotopes lead to Change in position of isotopes which were placed wrongly in Mendeleev's periodic table. Mendeleev's periodic law was unable to explain the location of isotopes.
There were mamy anomalies in Mendeleev's periodic table which were later revised according to the new discoveries.
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