Write two similarities of hydrogen with alkali metals.

Explanation

Two similarities of hydrogen with alkali metals are as follows:
i) Electropositive character: Hydrogen and alkali metals have one electron each in their valence shell. Both form monovalent cation.
For example, `H to H^+ + e^-`
`Na to Na^+ + e^-`
ii) Oxidation state : Both hydrogen and alkali metals show +1 oxidation state and can lose one electron each. For example, `H^+ Br^- , Li^+ Br^-`.