Strontium
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Strontium is a chemical element, having the chemical symbol Sr.
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Its atomic number (the number of protons) is 38. It has a Standard Atomic Weight of 87.62(1), and is typically found as a solid in its elemental form.
Strontium is considered to be a member of the "Alkaline Earth Metal" class of elements, has a boiling point of 1382 °C , and a melting point of 777 °C .