Strontium

Statistics:

• Name: Strontium
• Symbol: Sr
• Classification: Alkaline Earth Metal
• Atomic Number: 38
• Atomic Mass: 87.62 g/mol
• Density: 2.63 g/cm³
• Melting: 769°C
• Boiling: 1384°C
• Protons & Electrons:38
• Neutrons:50
• Discovered: 1790
• Discovered By: Crawford
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Electrons Per Energy Level:

• Level 1: 2
• Level 2: 8
• Level 3: 18
• Level 4: 8
• Level 5: 2

Isotopes:

Isotope: Half-life

• ⁸²Sr: 25.55 days
• ⁸³Sr: 32.41 hours
• ⁸⁴Sr: stable
• ⁸⁵Sr: 64.84 days
• ⁸⁵Sr: 67.63 minutes
• ⁸⁶Sr: stable
• ⁸⁷Sr: stable
• ^87m1Sr: 2.803 hours
• ⁸⁸Sr: stable
• ⁸⁹Sr: 50.53 days
• ⁹⁰Sr: 28.79 years
• ⁹¹Sr: 9.63 hours
• ⁹²Sr: 2.71 hours
• ⁹³Sr: 7.423 minutes

Brief Summary

Strontium is a Alkaline Earth Metal with the symbol 'Sr' and contains 38 Protons & Electrons with 50 neutrons in the nucleus of the atom. Strontium has an atomic mass of 87.62 g/mol and, at a temperature of 20°C, has a density of 2.63 g/cm³. It will melt at a temperature of 769°C and boil at 1384°C.

Strontium was discovered by Crawford in 1790 and is named 'Strontium' Strotian, a Scottish town.

Some common usages for Strontium: crimson colored flares and fireworks.

Definitions and Notes

Density listed is at a temperature of 20°C.

Isotopes are forms of an element who have the same atomic number but different mass because they contain different number of neutrons.

Half-life is the time required for a quantity of a subject to fall to half of its current quantity.

MLA Citing Format

Strontium :: Sr :: 38 - Chemical Element. 11 Mar. 2010 <http://www.chemicalelement.com/element/strontium.html>.