Strontium is a
chemical element. It has the chemical symbol Sr. It has the
atomic number 38. It is a
metal. The colour of the metal is silver-white or yellow-silver. The metal is
In chemistry it is placed in a group of metal elements named the
alkaline earth metals. Strontium has a high
chemical reactivity. The metal turns yellow when exposed to air. Strontium has properties similar to those of its two vertical neighbours in the
It is found naturally in the
strontianite. The 90Sr
isotope is present in
fallout and has a
half-life of 28.90 years.
Strontium forms salts which make a red flame when they burn. They are used in flares for signalling the position of survivors or shipwrecks and to make the red colour in fireworks.
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