Question

There was ambiguity about the correct position of hydrogen in Mendeleev's periodic table.​

Answer 1

Answer:

Yes and that ambiguity was the hydrogen was placed in Group I, Period 1 of the Mendeleev's Periodic Table. This column and row had elements present which showed properties equivalent to metals.

On the other hand, although it was true that Hydrogen has properties equivalent to metals, it's also true that it showed properties equivalent to Halogens [Fluorine, Chlorine etc.] which had their place in the Group VII of the Mendeleev's Periodic Table. This created an anomaly in the position of Hydrogen in that table and still yet, it has not been figured out.

I hope this helps.

Answer 2

Answer:

Hydrogen's position was not justified in the very old Mendeleev's periodic table. He positioned hydrogen in the first column above alkali metals. He did so because hydrogen and alkali metals have similar properties

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