Alkaline and alkali earth metals are basic elements, and the compounds which they form are also basic compounds. When added to water, the solutions shows pH values higher than pH 7. These compounds are used for various purposes, such as reducing or neutralizing the acidity of a medium. alkaline earth metals are group 2 of the periodic tables, whereas alkali metals are in group 2. The major difference between alkaline and alkali is that alkaline earth metals have two valence …