Question

Reflections on Concepts
1. What are the limitations of Mendeleeft's periodic table? How could the modern periodic table
overcome the limitations of Mendeleeff's table? (AS)​

Answer 1

Answer:

limitations of mendeleeves periodic table

1.anamolous pairs

argon with atomic mass 39.9 precedes potassium with atomic mass 39.1

2.It does not explain the electron arrangement of elements

3.Hydrogen was not given a fixed position

4.Elements that were chemically similar like gold and platinum were placed in separate groups

The atomic no.of argon is 18 and its mass no. is 40 while the atomic no. of potassium is 19 and its mass no. is 39.So according to modern periodic law,elements are arranged in increasing order of atomic no.

So argon with its lower atomic no.should come first and potassium with higher atomic mass should come later.So the position of argon and potassium was justified.