Question

compare and construct the arrangement of element in Mendeleev periodic table and Modern Periodic Table​

Answer 1

Answer:

sopooooooooooooo I know but forgot

Answer 2

Explanation:

Mendeleev's periodic table- 

> No fixed position was assigned to Hydrogen.

> Elements are arranged in the increasing order of their atomic masses. 

> There are 8 Groups. 

> Each groups are subdivided into sub group 'a' and 'b' 

> Groups for Noble gas was not present as noble gases were not discovered by that time. 

> There was no place for isotopes. 

Modern periodic table - 

> Hydrogen is given fixed position.

> Elements are arranged in the increasing order of their atomic numbers. 

> There are 18 Groups. 

> Groups are not subdivided into sub-groups. 

> A separate group is meant for noble gases. 

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

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