Question

2.
Which of the following is a defect in the
Mendeleev's periodic table?
(a) The position of alkali metals
(b) The position of transition metals
(c) The position of isotopes
(d) All of these​

Answer 1

Answer:

(d) All of these

Explanation:

hope it helps you.......

Answer 2

Answer:

c is the right option......