Hydrogen had valency 1 but is nit considered as a metal. Why?
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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. However, it varies greatly from the alkali metals as it forms cations (H+) more reluctantly than the other alkali metals.
Aultron:
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Now, Hydrogen is basically a rogue element, that does not fit in anywhere in this periodic table. Even though it has only1 valence electron and should ideally be placed above the Alkali Metals Group (which it is), it is neither a metal, nor is it a solid like all other Alkali Metals in the group.
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