Why hydrogen is placed with alkali metals but not with halogens in tge periodic table?
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Hydrogen is a nonmetal and is placed above group in the periodic table because it has ns1 electron configuration like the alkali metals. ... Because hydrogen is a nonmetal and forms H- (hydride anions), it is sometimes placed above the halogens in the periodic table. Hydrogen also forms H2 dihydrogen like halogens.
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it reacts vigorously with o2
it has 1 valenCe electron
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