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bluestone, common name for the blue, crystalline heptahydrate of cupric sulfate called chalcanthite, a minor ore of copper.ore on bluestone from Infoplease: 1  bluestone: meaning and definitions-bluestone: Definition and Pronunciation. 2  Irving Bluestone-Biography of Irving Bluestone, Chief negotiator for General Motors employees in the 1970s and advocate of worker participation in management.
This is due to the similar electronic configuration (more importantly the number of valence electrons). Among the two groups given here, choice (b) Mg, Sr and Ba are alkaline earth elements (part of group IIA) in the periodic table. Other elements of this group are Be, Ca and Ra. All these elements form the alkaline earth metal group of the periodic table. All these elements have 2 valence electrons, which they can give up to attain a +2 charge as cations. They have certain common properties, including shiny and silver-white appearance.