991,278
edits
Changes
mLine 2:
Line 2: − +
KS update 1.4
'''Caesium''' (or '''cesium''') is the [[chemical element]] with the [[atomic number]] 55 on the [[periodic table]]. Its symbol is '''Cs'''.
'''Caesium''' (or '''cesium''') is the [[chemical element]] with the [[atomic number]] 55 on the [[periodic table]]. Its symbol is '''Cs'''.
Caesium is an [[alkali]] [[metal]]. Its [[melt]]ing point is low (28 °C). It is extremely [[Reaction|react]]ive. Because of its high reactivity, it is a [[danger]]ous chemical. It may set itself on fire (ignite) in air. It [[Explosion|explode]]s on contact with water. It reacts more violently than the other [[alkali metal]]s with water. Because of this, caesium is stored in [[mineral oil]].<ref name=USGS>William C. Butterman ''et al'' 2004. {{cite web|url = http://pubs.usgs.gov/of/2004/1432/2004-1432.pdf|publisher = United States Geological Survey|accessdate = 2009-12-27|title = Mineral Commodity Profile: Cesium}}</ref>
Caesium is an [[alkali]] [[metal]]. Its [[melt]]ing point is low (28 °C). It is extremely [[Reaction|reactive]]. Because of its high reactivity, it is a [[danger]]ous chemical. It may set itself on fire (ignite) in air. It [[Explosion|explodes]] on contact with water. It reacts more violently than the other [[alkali metal]]s with water. Because of this, caesium is stored in [[mineral oil]].<ref name=USGS>William C. Butterman ''et al'' 2004. {{cite web|url = http://pubs.usgs.gov/of/2004/1432/2004-1432.pdf|publisher = United States Geological Survey|accessdate = 2009-12-27|title = Mineral Commodity Profile: Cesium}}</ref>
Caesium is a rare element. Since there is little caesium on the [[Earth]], it is rather expensive. The human body does not need caesium. In large amounts, its [[chemical compound]]s are mildly poisonous because it is close to [[potassium]], which the body does need.
Caesium is a rare element. Since there is little caesium on the [[Earth]], it is rather expensive. The human body does not need caesium. In large amounts, its [[chemical compound]]s are mildly poisonous because it is close to [[potassium]], which the body does need.