Question

5. Mendeleev could not assign a correct position of hydrogen in his periodic table.Why?​

Answer 1

Explanation:

Hydrogen has no fixed position in Mendeleev's Periodic Table

because it resembles alkali metals by forming positive ions and resembles halogens by forming diatomic molecule

Answer 2

Answer:

Mendeleev's periodic law could not assign a fixed position to hydrogen in the periodic table because hydrogen resembled both alkali metals (Group 1) and halogens (Group 17) in some of its properties. Hydrogen reacts with metals to form ionic compounds called hydrides and also with non-metals to form covalent compounds.