Chemical Elements.com - Strontium (Sr)

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   Atomic Number
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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

Number of Energy Levels: 5

First Energy Level:

Second Energy Level:

Third Energy Level:

Fourth Energy Level:

Fifth Energy Level:

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

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