Compare and contrast the arrangement of elements in Mendeleev’s Periodic Table and the Modern Periodic Table.

Asked by Vishal kumar | 2 years ago |  537

1 Answer

Solution :-

Mendeleev’s Periodic Table Modern Periodic Table
Elements are arranged in the increasing order of their atomic masses Elements are arranged in the increasing order of their atomic numbers.
There are 8 groups There are 18 groups
Each group is subdivided into subgroup 'a' and 'b' Groups are not subdivided into subgroups.
Groups for Noble gas was not present as noble gases were not discovered by that time A separate group is meant for noble gases.
There was no place for isotopes. This problem has been rectified as slots are determined according to atomic number.

 

Answered by Shivani Kumari | 2 years ago

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