Sr Strontium 38 87.62 2 5 s 38 769.0 1384.0 [Kr] 5s2 2 8 18 8 2 2.54 0.036% Silver Cubic: Face centered 1.0 0.963 {"1":"549.5","2":"1064.2","3":"4138","4":"5500","5":"6910","6":"8760","7":"10230","8":"11800","9":"15600","10":"17100","11":"31270"} 550 5.03 192 2 2.15 33.7 8.2 136.9 0.3 35.3 0 Solid, Paramagnetic, Conductor, AlkalineEarthMetal, Metal, Stable, Natural STRON-she-em Soft, malleable, silvery-yellow metal. Used in flares and fireworks for crimson color. Strontium-90 is a long lived highly radioactive fallout product of atomic-bomb explosions. Found in minerals celestite and strontianite. f7NiPdD1Xx0 Strontium

Cobalt compounds have been used for centuries to impart a rich blue color to glass, glazes and ceramics.

The element was first isolated by Swedish chemist George Brandt in 1735.

He showed it was the presence of the element cobalt that caused the blue color in glass, not bismuth as previously thought. From the German word Kobald, goblin or evil spirit; also from the Greek cobalos, mine 38 1790 Adair Crawford Scotland Named after the village of "Strontian" in Scotland

Cobalt and its compounds are considered to be slightly toxic

Supplemental colbalt is essential in sheep's diets to improve the wools quality

Cobalt is used in the preparation of magnetic, wear-resistant and high-strength alloys.

Cobalt is widely used in batteries and in electroplating.

Radioactive ⁶⁰Co is used in the treatment of cancer.

A solution of the chloride is used as a sympathetic ink.