Darkanimz
Would you like to react to this message? Create an account in a few clicks or log in to continue.


All joints at their limits ©
 
HomeLatest imagesRegisterLog in

 

 Caesium - topic

Go down 
2 posters
AuthorMessage
be_map1512
Over 100 posts !
Over 100 posts !



Posts : 141
Join date : 2010-11-14

Caesium - topic Empty
PostSubject: Caesium - topic   Caesium - topic I_icon_minitimeSun Nov 28, 2010 11:24 pm

Caesium is the chemical element with atomic number 55. A soft, silvery-gold alkali metal with a melting point of 28 °C (83 °F), it is one of only five metals that are liquid at or near room temperature. It has physical and chemical properties similar to those of rubidium and potassium. The metal is extremely reactive and pyrophoric, reacting with water even at −116 °C (−177 °F). It is the least electronegative element with stable isotopes, of which it has only one, caesium-133. Caesium is mined mostly from pollucite, while the radioisotopes, especially caesium-137, are extracted from waste produced by nuclear reactors. German chemists Robert Bunsen and Gustav Kirchhoff discovered caesium in 1860 by flame spectroscopy. The first small-scale applications for caesium have been as a "getter" in vacuum tubes and in photoelectric cells. In 1967, a specific frequency from the emission spectrum of caesium-133 was chosen for use in the definition of the second by the International System of Units. Since then, caesium has been widely used in atomic clocks. Since the 1990s, the largest application of the element has been as caesium formate for drilling fluids

Best HGH
buy job postings
Back to top Go down
gaunpro
Over 100 posts !
Over 100 posts !



Posts : 301
Join date : 2010-11-26

Caesium - topic Empty
PostSubject: Re: Caesium - topic   Caesium - topic I_icon_minitimeTue Jan 11, 2011 9:08 am

Diet pills have become increasingly popular, and now, there are literally dozens, maybe even hundreds, of these pills to choose from. How can you be sure the diet pill you choose is really safe and will get the results you demand?



charms for bracelets
Football games
Back to top Go down
 
Caesium - topic
Back to top 
Page 1 of 1

Permissions in this forum:You cannot reply to topics in this forum
Darkanimz :: General :: General Chat-
Jump to: