Note:  Do not rely on this information. It is very old.

Alkaline Earths

Alkaline Earths, the metals Barium, Strontium, and Calcium are known as the metals of the alkaline earths. The compounds of these metals are somewhat alkaline in their properties; but are distinguished from the true alkalis by their comparative insolubility in water. Lime (Oxide of Calcium) is the principal alkaline earth which occurs in nature.