Question

Reason(s) for the anomalous position of hydrogen in Mendeleev’s periodic table
is/are

• A. NaH can be formed similar to NaCl.
• B. $H_{2}O$ can be formed similar to $N{a}_{2}O$.
• C. Hydrogen exists as a diatomic molecule similar to that of chlorine.
• D. All of these

Answer 1

The correct option is D All of these

Mendeleev’s Periodic Law: The properties of elements are the periodic functions of their atomic masses.
But here the properties of hydrogen match with both alkali metals and halogens.

• Similar to alkali metals, hydrogen can form compounds. $(N{a}_{2}O$ and $H_{2}O)$
• Similar to halogens, hydrogen can form compounds. (NaCl and NaH).
• Similar to halogens, hydrogen exists as a diatomic molecule.