Question

which was the position of hydrogen not fixed in Mendeleev's periodic table?

Answer 1

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Hence, it was placed in IA group VI B group and could not be given a fixed position in Mendeleev's Periodic Table. It is so because hydrogen has 1 valence electron in its outermost shell.so according to modern periodic table, hydrogen can be arranged in halogen family group no.

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Answer 2

because hydrogen has only one electron and to get balanced it can give or take one electron. so, its place is not fixed in mandeleev's periodic table