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Additional
Strontium
English Wikipedia - The Free Encyclopedia
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Strontium
Strontium
is a
chemical element
with symbol
Sr
and
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 it is exposed to
air
. Strontium has physical and chemical properties similar to those of its two vertical neighbors
calcium
and
barium
. It occurs naturally in the
minerals
celestine
,
putnisite
and
strontianite
. While natural strontium is stable, the synthetic
90
Sr
isotope
is present in
radioactive
fallout
and has a
half-life
of 28.90 years.
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