| − | '''Strontium''' is a [[chemical element]] used to create the red color in flares and fireworks. It was first isolated in 1808 by Sir [[Humphry Davy]]. <ref> [http://environmentalchemistry.com/yogi/periodic/Sr.html#Overview Periodic Table of Elements: Strontium] </ref> | + | '''Strontium''' is a [[chemical element]] used to create the red color in flares and fireworks. It was first isolated in 1808 by Sir [[Humphry Davy]].<ref>[http://environmentalchemistry.com/yogi/periodic/Sr.html#Overview Periodic Table of Elements: Strontium]</ref> |