Mendeleev could not assign a correct position to which of the following elements in his table ?

Tina Singh • 10.85K Points
Tutor II Chemistry

Q. Mendeleev could not assign a correct position to which of the following elements in his table ?

(A) Lithium
(B) Potassium
(C) Hydrogen
(D) Helium

Correct Answer - Option(C)

Explanation by: Tina Singh

The position of hydrogen was not justified in Mendeleev's periodic table. He positioned hydrogen in the first column above alkali metal. Hydrogen resembles not only alkali metals but also halogens in several ways. Hence, hydrogen can also be placed above the halogen group

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