Changes

==Properties==

==Properties==

Melting Point: 2723°F (1495°C or 1768 K)

Melting Point: 2723 °F (1495 °C or 1768 K)

   

   

Boiling Point: 5301°F (2927°C or 3200 K)

Boiling Point: 5301 °F (2927 °C or 3200 K)

   

   

Density: 8.86 grams per cubic centimeter

Density: 8.86 grams per cubic centimeter

==History==

==History==

The tomb of Pharaoh Tutankhamen, who ruled from 1361-1352 BC, contained a small glass object colored deep blue with cobalt. Cobalt blue was known even earlier in China and was used for pottery glazes.<ref>http://www.rsc.org/periodic-table/element/27/cobalt</ref>

The tomb of Pharaoh Tutankhamen, who ruled from 1361-1352 BC, contained a small glass object colored deep blue with cobalt. Cobalt blue was known even earlier in China and was used for pottery glazes.<ref>http://www.rsc.org/periodic-table/element/27/cobalt</ref>

Modern cobalt was officially discovered by a Swedish chemist named Georg Brandt, in 1739. <ref>http://education.jlab.org/itselemental/ele027.html</ref>

Modern cobalt was officially discovered by a Swedish chemist named Georg Brandt, in 1739.<ref>http://education.jlab.org/itselemental/ele027.html</ref>

==Uses==

==Uses==

Cobalt is used in several alloys, including Alnico.  These alloys are used in things like jet turbines and gas turbine generators.  Cobalt salts have been used for centuries to give pottery and other items a blue color.  Radioactive cobalt-60 is also useful to treat cancer and in some countries, to irradiate food for preservation. <ref>http://www.rsc.org/periodic-table/element/27/cobalt</ref>

Cobalt is used in several alloys, including Alnico.  These alloys are used in things like jet turbines and gas turbine generators.  Cobalt salts have been used for centuries to give pottery and other items a blue color.  Radioactive cobalt-60 is also useful to treat cancer and in some countries, to irradiate food for preservation.<ref>http://www.rsc.org/periodic-table/element/27/cobalt</ref>

==References==

==References==

<references />

<references />

{{Template:Periodic table}}

{{Periodic table}}

[[Category:Metals]]

[[Category:Metals]]