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saved searches - My saved topics - My newsletter Strontium
(pronounced /ˈstrɒntiəm/) is a chemical element with the symbol
Sr and the atomic number 38. An alkaline earth metal, strontium
is a soft silver-white or yellowish metallic element that is
highly reactive chemically. The metal turns yellow when exposed
to air. It occurs naturally in the minerals celestine and
strontianite. The 90Sr isotope is present in radioactive fallout
and has a half-life of 28.90 years. Strontium is a bright
silvery metal that is softer than calcium and even more reactive
in water, which strontium decomposes on contact with to produce
strontium hydroxide and hydrogen gas. It burns in air to produce
both strontium oxide and strontium nitride, but since it does
not react with nitrogen below 3