![[ATOM]](atom.gif) |
Strontium
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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]](b0038.gif) |
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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
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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