alkaline earth metal
In the past, chemists used the term "earth" to denote slightly soluble metal oxides. The oxides of barium, strontium, and calcium resemble alumina (Al2O3), a typical "earth", but form alkaline mixtures with water. For this reason barium, strontium, and calcium were called alkaline earth metals. This name was later extended to include all of the elements of group 2.
Related category• INORGANIC CHEMISTRY
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