(also alkaline earth metal)
Any of the elements beryllium, magnesium, calcium, strontium, barium, and radium, occupying Group IIA (2) of the periodic table. They are reactive, electropositive, divalent metals, and form basic oxides that react with water to form comparatively insoluble hydroxides.
- Barium is the fifth element in Group 2 of the periodic table, the alkaline earth elements.
- Family 2 on the periodic table is the alkaline earth metals with two valence electrons.
- Four important chemical family names of elements still widely used are the alkali metals, the alkaline earths, the halogens, and the noble gases.
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Syllabification: al·ka·line earth
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