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Information valid for Sr-88 unless otherwise noted

Basic Information

Symbol: Sr
Atomic Number: 38
Mass: 87.62
Melting Point: 769.0 C
Boiling Point: 1384.0 C
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

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


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


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