Question

28:15 Why 'is
Modern Periodic Table considered
a better one. Than Mendeleeves Table ?
How does The Moderne Periodic law
explain the following ?
i) Valency of the elements in a period and a group.ii) Atomic size of the elements in a period and a group.​

Answer 1

Answer:

ANSWER

            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.

Explanation:

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