Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

For questions about the alkali metals (group 1), their compounds, and their physical and chemical properties. For questions specifically about hydrogen, use tag [hydrogen] instead.

The alkali earth metals are six chemical elements in group 1 of the periodic table. They are lithium ($\ce{Li}$), sodium ($\ce{Na}$), potassium ($\ce{K}$), rubidium ($\ce{Rb}$), cesium ($\ce{Cs}$), and francium ($\ce{Fr}$).

Although hydrogen belongs to the same group, several of its properties do not match those of the alkali metals. Hence, should be used for such questions. Also see: Where hydrogen belongs in the Periodic Table

history | excerpt history