Question

why hydrogen place is not fixed​

Answer 1

Explanation:

Because it shows Halogens properties but it has only one electron in its valency shell

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Answer 2

The position of hydrogen in the modern periodic table is not fixed because:

1. It resembles the properties of G-1 elements (Alkaline Metals) as it forms H⁺ ions like Na⁺ and K⁺ ions.
2. At the same time, it also resembles the properties of G-17 elements (Halogens) as it is diatomic in nature as it forms H₂ molecule like Cl₂ and Br₂ molecules.

Hence, the position of hydrogen in the modern periodic table is not fixed.