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alkaline-earth metal
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alkaline-earth metal

Any of a group of six metallic elements with similar bonding properties: beryllium, magnesium, calcium, strontium, barium, and radium. They form a linked group in the periodic table of the elements. They are strongly basic, bivalent (have a valency of two), and occur in nature only in compounds. Calcium and magnesium are abundant on Earth and essential for all organisms, while the other three elements are relatively rare.



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? Mentioned in ? References in periodicals archive
 
The mystery element is an alkaline earth metal, or one of a group of elements that is highly reactive in nature.
Name that element! Which element on the periodic table helps play ... by Carney, Elizabeth / Science World
But he argues that placing helium with the alkaline earth metals results in a more regularly shaped structure that can take two forms.
The nature of things: attempts to change the periodic table raise ... by Goho, Alexandra / Science News
But this alkaline earth metal is more commonly found in compounds (two or more elements that are chemically combined).
Name that element! Our popular mystery series returns! by Hoffmann, Gretchen / Science World
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