hydrogen resembles halogens in that it exists as a
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It resembles halogens because it needs one electron to completely fill its valence shell to attain noble gas configuration. It also forms diatomic molecule, combines with metals and non-metals to form compounds.
The principal similarity between hydrogen and the halogens is in electron configuration. Hydrogen has one electron in its electron shell, needing one additional electron to fill that shell. The halogens all have seven electrons in their outer electron shells.
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