Difference between revisions of "Cesium"
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(add more info -- I think the alkali metals are stylistically consistent now.) |
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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 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. | ||
| − | It was discovered by Robert Bunsen and Gustav Kirchoff, using their newly invented spectroscope, and was the first element 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. |
==References== | ==References== | ||
Revision as of 00:21, May 18, 2007
| Cesium | |
|---|---|
| Properties | |
| Atomic symbol | Cs |
| Atomic number | 55 |
| Classification | Alkali metal |
| Atomic mass | 132.9 amu |
| Other Information | |
| Date of discovery | 1860 |
| Name of discoverer | Bunsen, R.W. and Kirchoff, G. |
| Name origin | From the Latin Caesius, meaning "sky blue" |
| Uses | removing air traces in vacuum tubes |
| Obtained from | lepidolite, pollucite |
Cesium is an element[1]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.
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.
References
- ↑ Wile, Dr. Jay L. Exploring Creation With Physical Science. Apologia Educational Ministries, Inc. 1999, 2000