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{{Element | name=Cesium | symbol=Cs | anumber=55 | amass=132.9 amu | state=solid/liquid | class=Alkali metal | cstructure=Body-Centered Cubic | color=Yellow-Silver | date=1860 | discname=[[Bunsen, R.W. and Kirchoff, G.]] | origname=From the Latin ''Caesius'', meaning "sky blue" | uses=removing air traces in vacuum tubes | obtained=lepidolite, pollucite }}
{{Element | name=Cesium | symbol=Cs | anumber=55 | amass=132.9 amu | state=solid/liquid | class=Alkali metal | cstructure=Body-Centered Cubic | color=Yellow-Silver | date=1860 | discname=[[Bunsen, R.W. and Kirchoff, G.]] | origname=From the Latin ''Caesius'', meaning "sky blue" | uses=removing air traces in vacuum tubes | obtained=lepidolite, pollucite }}
'''Cesium''' is an element<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>in the Alkali metals class of the periodic table. It is so chemically active that it is never found free (in elemental form) in nature, and catches fire on mere exposure to air.
'''Cesium''' is an element<ref>Wile, Dr. Jay L. ''Exploring Creation With Physical Science''. Apologia Educational Ministries, Inc. 1999, 2000</ref>in the Alkali [[metal]]s class of the periodic table. It is so chemically active that it is never found free (in elemental form) in nature, and catches fire on mere exposure to air.
It was discovered by Robert Bunsen and Gustav Kirchoff, using their newly invented spectroscope, and was the first element to be discovered spectroscopically. It (along with [[rubidium]]) was identified by a previously unseen blue spectral line in the analysis of mineral water from a German spa. The name comes from that color.
It was discovered by Robert Bunsen and Gustav Kirchoff, using their newly invented spectroscope, and was the first element to be discovered spectroscopically. It (along with [[rubidium]]) was identified by a previously unseen blue spectral line in the analysis of mineral water from a German spa. The name comes from that color.