Alkaline Earth

The alkaline earth metals are a series of elements comprising Group 2 (IUPAC style) of the periodic table: beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba) and radium (Ra). The alkaline earth metals provide a good example of group trends in properties in the periodic table, with well characterised homologous behaviour down the group.
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Noun
1. any of the bivalent metals of group II of the periodic table (calcium or strontium or barium or magnesium or beryllium)
(synonym) alkaline-earth metal
(hypernym) metallic element, metal

family of group IIA elements, beryllium, Be, magnesium, Mg, calcium, Ca, strontium, Sr, barium, Ba, and radium, Ra. The oxides and hydroxides of these elements are strong bases. See also,  alkaline.

 Say it 
An oxide of an alkaline earth metal , which produces an alkaline solution in reaction with water.