Question

Compare and contrast the arrangement of elements in mendeleev's periodic table and the modern periodic table.​

Answer 1

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Answer:  Mendeleev's periodic table

1. Elements were arranged in increasing order of atomic masses.

2. There are 8 groups.

3. Each group is divided into subgroups a and b.

4. The group for noble gases was not present, as noble gases were not discovered at that time.

5. There was no place for isotopes.

Modern periodic table

1. Elements are arranged in increasing order of atomic numbers.

2. There are 18 groups.

3. Groups are not divided into subgroups.

4. A separate group, i.e. group 18 is present for noble gases.

5. This problem was rectified, as slots are determined on the basis of atomic number.

Answer 2

Answer:

Mendeleev's periodic table:-

-Elements are arranged in the increasing order of their atomic masses

-There are 8 groups

-Each group is subdivided into subgroup 'a' & 'b'

-Groups for nobel gas was not present as nobel gases were not discovered at that time.

-There was no place for isotopes

Modern periodic table:-

-Elements are arranged in the increasing order of their atomic masses

-There are 18 groups

-Their groups are not subdivided into sub groups

-A separate group is meant for nobel gases

-This problem has been rectified as slots are determined according to atomic number.

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