1. Discuss the position of hydrogen in Mendeleev's periodic table.
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★Hydrogen had no fixed position in Mendeleev's Periodic Table because it resembles alkali metals by forming positive ions and resembles halogens by forming diatomic molecule.
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Answer. Hydrogen element has been placed at the top of group 1 above the alkali metals because the electronic configuration of hydrogen is similar to those of alkali metals, both hydrogen as well as alkali metals have 1 valence electrons in each.
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