Mendeleev's periodic table is based on atomic mass The modern periodic table is based on the atomic number
Mendeleev's periodic table contains about 63 elements. The modern periodic table contains about 118 elements
In Mendeleev's periodic table there were gaps for undiscovered elements. The modern periodic table maintains uniformity.
In Mendeleev's periodic table noble gases were not placed (as they are not discovered at that time). In the Modern periodic table noble gases are in a separate group named group-18.
In Mendeleev's periodic table transition elements included with other elements In the Modern periodic table transition elements are placed in a separate block.
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Explanation:
Mendeleev's periodic table Modern periodic table
Mendeleev's periodic table is based on atomic mass The modern periodic table is based on the atomic number
Mendeleev's periodic table contains about 63 elements. The modern periodic table contains about 118 elements
In Mendeleev's periodic table there were gaps for undiscovered elements. The modern periodic table maintains uniformity.
In Mendeleev's periodic table noble gases were not placed (as they are not discovered at that time). In the Modern periodic table noble gases are in a separate group named group-18.
In Mendeleev's periodic table transition elements included with other elements In the Modern periodic table transition elements are placed in a separate block.
Answer:
This table summarises some similarities and differences between Newlands' table and Mendeleev's table.