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Both doesn't resemblance in characters, but in few Because both has a single election in their outer most shell( valence shell) and has a strong monovalent reducing property (transfer of his atom that can participate in forming chemical bonds)
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Hydrogen has all the properties of an alkali metal just like potassium, sodium and so on (only about 2 or 3 exceptions because it is a gas) that is why it is placed and has a resemblance with alkali metals.
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