Question

compare and contrast the arrangement of elements in Mendeleev periodic table and the modern periodic table​

Answer 1

Answer:

Ans.: (i) In Mendeleev's periodic table the elements are arranged in the increasing order of atomic masses. On the other hand, in the modern periodic table the elements are arranged in the increasing order of atomic numbers which is more fundamental property than atomic mass.

Answer 2

Answer:

Hey mate answer of your question is given below by me...

Mendeleev's Periodic Table.....

Explanation:

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

2.

There are a total of 7 groups (columns) and six periods ( Rows ).

3.Elements having similar properties were placed to directly under one another .

4.The position of hydrogen could not be explained.

5.No distinguishing positions for metals and nonmetals .

Modern Periodic Table...

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

2.There are a total of 18 groups (columns) and 7 periods (rows).

3.Elements having the same valence shell are present in the same period while elements having the same number of valence electrons are present in the same groups.

4. Hydrogen is placed above alkali metals metals .

5. Metals are present at the left hand side of the periodic table whereas non metals are present .

I hope it can help you ....

Please mark as brainlist..

Thanks.....