01 n. A rare alkaline metal found in mineral water; -- so called from the two characteristic blue lines in its spectrum. It was the first element…
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A rare alkaline metal found in mineral water; -- so called from the two characteristic blue lines in its spectrum. It was the first element discovered by spectrum analysis, and is the most strongly basic and electro-positive substance known. Symbol Cs. Atomic number 55. Atomic weight 132.6.(Chem.)