Question

Mendeleev's classification cannot assign position to
a) Hydrogen
b) Isotopes
c) hydrogen and Isotopes d) Hydrogen, Oxygen and Sulphur​

Answer 1

Explanation:

The properties of elements are a periodic function of their atomic masses. It was the discovery of atomic number which led to a change in Mendeleev's periodic law which was based on atomic mass. ...

A correct position could not be assigned to Hydrogen in the periodic table.

Answer 2

Mendeleev's classification cannot assign position to Hydrogen.

• Mendeleev designed the periodic table according to their atomic masses because he observed that there is a relation between chemical and physical properties of atoms with similar atomic masses.
• But he was confused with the position of Hydrogen because hydrogen showed the properties of both alkali metals and halogens.