Question

8.   State any two limitations to Mendeleev’s classification.
    How does electronic configuration of atoms change in period with increase in atomic number?

Answer 1

hey....

gm...

limitations of mendeleeff are as follows...

dissimilar elements were place together.eg.mg and cl...

placing anomolous series..

Te and I

.......

by it's valency...

by it's shells ..

by it's orbitals...that is s,p,d,f...

ex .1 st group is alkali metal family

8 the group inert gas family

Answer 2

Answer:

Explanation: The two limitations of Mendeleev's Periodic Table are -

1. The position of Hydrogen could not be justified as it represents alkali metals of group 1 and halgens of group 17.

2. The positions of isotopes could not be fixed as the table was based on atomic mass.

ANSWER TO THE SECOND PART.

- The electronic configuration increases by one electron in a period

- Increasing atomic mass increases the no of electrons