what do you mean by rogue element of periodic table
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Hydrogen is in Group 1. ... H exhibits properties of both, Alkali metals like, 1 valence electron, ability to form halides etc. and those of halogens like non-metal, diatomic molecule, gaseous state etc. Hence it position is not fixed in the periodic table and called as a rogue element.
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it is hydrogen as it is an alkali metal with one valence electron and can form halides and also give properties of hallogens.
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