Question

Why alkali metals are solid but hydrogen is a gas with diatomic molecules do you justify the inclusion of hydrogen and first group with alkali metals?

Answer 1

because of its small size and high electronegativity it is a non metal with high i.p it shares one electron with another hydrogen and forms diatomic molecules

Answer 2

All alkali metals are solid except hydrogen because of hydrogen has small size and high electronegativity. It is a non metal with lp where another are metels. It shares its one electron with another hydrogen and form diatomic molecules.