Strontium

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Granules of tungsten in a glass tube.
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Granules of tungsten in a glass tube.

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  soft. 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.

It is  found naturally in the minerals celestite and  strontianite. The 90Sr isotope is  present in radioactive fallout and  has a half-life of 28.90 years.

A piece of strontianite.
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A piece of strontianite.

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STATIC WIKIPEDIA JUNE 2008 on wikipedia2006.classicistranieri.com

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STATIC WIKIPEDIA MARCH 2008 on wikipeda2006classicistranieri.com
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STATIC WIKIPEDIA APRIL 2007 on wikipeda2006classicistranieri.com
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STATIC WIKIPEDIA DECEMBER 2006 on wikipeda2006classicistranieri.com
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STATIC WIKIPEDIA NOVEMBER 2006 on wikipeda2006classicistranieri.com
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