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Encyclopedia Britannica - Main :: AJA-ALL |
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ALKALINE EARTHS . The so-called alkaline earth-metals are the elements beryllium
calcium , strontium and barium. By the early chemists, the term
heating
condition , but occur most often in the form of carbonates and sulphates; they form oxides of the type RO, and in the case of calcium , strontium and barium, of the type R02. The oxides of type RO are soluble in water, the solution possessing a strongly alkaline reaction and rapidly absorbing carbon dioxide on exposure; they are basic in character and dissolve readily in acids with the formation of the corresponding salts. As the atomic weight
element
Beryllium
aluminium . Beryllium and magnesium are permanent in dry air; calcium, strontium and barium, however, oxidize rapidly on exposure. The salts of all the metals of this group usually crystallize well, the chlorides and nitrates dissolve readily in water, whilst the carbonates, phosphates
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