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Strontium at Chemical Elements.com
Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page

Basic Information

Name: Strontium
Symbol: Sr
Atomic Number: 38
Atomic Mass: 87.62 amu
Melting Point: 769.0 °C (1042.15 K, 1416.2 °F)
Boiling Point: 1384.0 °C (1657.15 K, 2523.2 °F)
Number of Protons/Electrons: 38
Number of Neutrons: 50
Classification: Alkaline Earth
Crystal Structure: Cubic
Density @ 293 K: 2.54 g/cm3
Color: yellowish

Atomic Structure

[Bohr Model of Strontium]  
Number of Energy Levels: 5

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 18
    Fourth Energy Level: 8
    Fifth Energy Level: 2


Isotope Half Life
Sr-8225.36 days
Sr-831.35 days
Sr-8564.84 days
Sr-85m1.27 hours
Sr-87m2.8 hours
Sr-8950.52 days
Sr-9029.1 years
Sr-919.5 hours
Sr-922.71 hours
Sr-937.4 minutes


Date of Discovery: 1790
Discoverer: A. Crawford
Name Origin: After Strotian (a Scottish town)
Uses: flares, fireworks, crimson color
Obtained From: celestite, strontianite

Related Links

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Bentor, Yinon. Chemical Element.com - Strontium. <http://www.chemicalelements.com/elements/sr.html>.

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