Compare Mendeleev and modern periodic tables
i) on the basis of groups.
ii) on the basis of properties of elements.
iii) on the basis of classification.

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Solution

Mendeleev's periodic table
Modern periodic table
Mendeleev's periodic table is based on atomic mass. Elements are arranged in increasing order of atomic mass.
Modern periodic table is based on atomic number.
Elements are arranged in increasing order of atomic mass.
There are a total of 7 groups and 6 periods. There are a total of 18 groups and 7 periods.
Elements having similar properties were placed directly one another. Elements having same valence shell were placed in the same period while elements having the same number of valence electons were placed in the same period.

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Similar questions

(a) On what basis did Mendeleev arrange the elements in his periodic table?

(b) On what basis are they arranged now?

In the modern periodic table, the elements are arranged on the basis of their increasing:

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Mendeleev's periodic table	Modern periodic table
Mendeleev's periodic table is based on atomic mass. Elements are arranged in increasing order of atomic mass.	Modern periodic table is based on atomic number. Elements are arranged in increasing order of atomic mass.
There are a total of 7 groups and 6 periods.	There are a total of 18 groups and 7 periods.
Elements having similar properties were placed directly one another.	Elements having same valence shell were placed in the same period while elements having the same number of valence electons were placed in the same period.