Caesium: Difference between revisions
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|elName=Caesium | |||
|eltrnCfg=1s<sup>2</sup>2s<sup>2</sup>2p<sup>6</sup>3s<sup>2</sup>3p<sup>6</sup>3d<sup>10</sup> 4s<sup>2</sup>4p<sup>6</sup>4d<sup>10</sup>5s<sup>2</sup>5p<sup>6</sup>6s<sup>1</sup> | |||
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|properties=Silvery-gold, soft, ductile metal. | |||
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Caesium is a [[Chemical elements|chemical element]], having the [[chemical symbol]] Cs. Its [[atomic number]] (the number of [[proton]]s) is 55. It has a [[Atomic mass#Standard atomic weights of the elements|standard atomic weight]] of 132.90545 g•mol<sup>−1</sup>. At the normal [[atmospheric pressure]] of 1 [[atmosphere (unit)|atm]], it is a liquid at temperatures above 28.5 °C. | |||
Caesium is considered a member of the "Alkali metal" class of element. At a [[pressure]] of 101.325 k[[Pascal (unit)|Pa]], it has a [[boiling point]] of 671 °[[Celsius (unit)|C]], and a [[melting point]] of 28.5 °C. In its elemental form, Rubidium is a solid at the normal atmospheric pressure of 1 atm and typical room temperatures of 15 − 25 °C. | |||
==Isotopes== | |||
<sup>137</sup>Cs is used widely in industry and medicine, but is also a common contaminant from nuclear reactor accidents. | |||
Latest revision as of 18:33, 25 April 2011
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Caesium is a chemical element, having the chemical symbol Cs. Its atomic number (the number of protons) is 55. It has a standard atomic weight of 132.90545 g•mol−1. At the normal atmospheric pressure of 1 atm, it is a liquid at temperatures above 28.5 °C.
Caesium is considered a member of the "Alkali metal" class of element. At a pressure of 101.325 kPa, it has a boiling point of 671 °C, and a melting point of 28.5 °C. In its elemental form, Rubidium is a solid at the normal atmospheric pressure of 1 atm and typical room temperatures of 15 − 25 °C.
Isotopes
137Cs is used widely in industry and medicine, but is also a common contaminant from nuclear reactor accidents.