In what group should we keep hydrogen that is group 1A or 7A( state your answer with a strong reason to support it) ?
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Well its a contradiction because:
Hydrogen in group 1:
like other elements in group 1 such as lithium and sodium ,hydrogen also reacts with oxygen to form oxides and hydroxides and gains a valency of +1
Hydrogen in group 17:
like other elements in group 17(ex-cl,br) it requires one more electron and combines with other metals and nonmetals to form covalent compounds gaining a valency of -1.
Therefore its not possible to give a proper position to Hydrogeen in the periodic Table
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