Question

What were the main demerits of Mendeleev’s periodic table?

(i) Hydrogen has been placed in group I though it resembled to group VII as well.

(ii) Position of some elements was not justified.

(iii) Isotopes were not given separate places.

(iv) Lanthanides and actinides ware not included in the table.

• A. (i), (ii) and (iii)
• B. (i), (ii), (iii) and (iv)
• C. (ii) and (iv)
• D. (i), (iii) and (iv)

Answer 1

Answer: (B)

(i), (ii), (iii) and (iv)

Answer 2

: All are the demerits of Mendeleev’s periodic table.