Strontium

CAS Number: 7440-24-6. A silvery-white metal that rapidly turns
yellow when it oxidizes. It is used in fireworks, signal flares
and in tracer bullets. Also added to alloys of tin and lead to
add hardness and durability. Strontium usually occurs as a
mixture of four stable isotopes. 26 other less common, yet
unstable isotopes exist, the most harmful of which is 90Sr. 90Sr
is the product of nuclear fallout and can cause health problems.
Chemical formula = Sr. Molecular weight = 87.62 g/mol.