Strontium at Chemical Elements.com 


 

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

Isotopes

Isotope Half Life
Sr-82 25.36 days
Sr-83 1.35 days
Sr-84 Stable
Sr-85 64.84 days
Sr-85m 1.27 hours
Sr-86 Stable
Sr-87 Stable
Sr-87m 2.8 hours
Sr-88 Stable
Sr-89 50.52 days
Sr-90 29.1 years
Sr-91 9.5 hours
Sr-92 2.71 hours
Sr-93 7.4 minutes

Facts


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