Question

How does hydrogen differ from alkali metals?

Answer 1

Hydrogen	Alkali Metal
Hydrogen can form both ionic as well as covalent compounds.	Alkali metals only form ionic compounds.
Hydrogen can accept as well as lose its single electron.	Alkali metals readily lose their electron to form a noble gas configuration.
Hydrogen is a gas at room temperature.	Alkali metals are solid at room temperature.
The ionisation energy of hydrogen ($313\mathrm{Kcal}{\mathrm{mol}}^{-1}$) is very high.	The alkali metals have comparatively lower ionisation energy (maximum of $147\mathrm{Kcal}{\mathrm{mol}}^{-1}$).