(Strontian, town in Scotland) Isolated by Davy in 1808. Found mainly as celestite and strontianite. Sr-90 has a half-life of 28 years.
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soft, decomposes in water, alkaline earth metal, silvery, tarnishes yellow, ignites in air when finely divided, salts are colorful
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fire works, flares, Sr-90 is a radioactive isotope produced by nuclear fallout, Sr-90 has the potential for use as lightweight nuclear producing electricity, used to produce glass for color television tubes, refining zinc, optical materials