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Strontium

Sr
Atomic Number:
Atomic Weight:
Element Type:
Crystal Structure:
Melting Point:
Boiling Point:
Critical Temp:
Atomic Radius:
Covalent Radius:
Electronegativity:
38
87.62
Alkali Earth Metal
Cubic Face Centered
777.0°C = 1430.6°F = 1050.15 K
1382.0°C = 2519.6°F = 1655.15 K
°C = °F = K
2.45 Å (Å = Angstrom = 10-10 m)
1.91Å
0.95

Discovery

(Strontian, town in Scotland) Isolated by Davey by electrolysis in 1808; however, AdairCrawford in 1790 recognized a new mineral (strontianite) as differing from other bariumminerals.

Uses

Strontium-90 is used in Systems for Nuclear Auxilliary Power (SNAP) devices. Strontium is used in producing glass for color television picture tubes. It is also used to produce ferrite magnets and to refine zinc. Strontium titanate is very soft but has an extremely high refractive index and an optical dispersion greater than that of diamond.

Isotopes

There are 20 known isotopes of strontium, 4 stable and 16 unstable. Natural strontium is a mixture of the 4 stable isotopes.


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