Strontium is located on the fifth period and the second group in the periodic table of elements. Its appearance is silvery gray with a melting point of 777 degrees Celsius. Strontium is a reactive member of the alkaline earth metals. It can form up to 2 bonds and has many compounds. It causes a flame to turn red. It was first identified in 1790 by Thomas Charles Hope. It was later isolated in 1808 by Humphry Davy. It easily forms oxides like the rest of the alkaline earth metals.

Strontium is commonly used in red fireworks and flares. the radioactive isotope Strontium 90 has been used as a tracer for cancer cells. Strontium renelate (C12H6N2O8SSr2) has been used in the treatment of osteoporosis.