The first Bose-Einstein condensate including this element, one of three metals which is liquid at room temperature, was observed at 45 nanokelvin in October 2002.  
The first Bose-Einstein condensate including this element, one of three metals which is liquid at room temperature, was observed at 45 nanokelvin in October 2002.  In 1995 its hydride was found to be stiffer than diamond, while its hydroxide is still the strongest existing base known to man.  Its 137 isotope has been used in radioactive dating with lead-210, but may be more notorious for rapidly destroying bone marrow and skin cells.  FTP, name this alkali metal, the most electropositive element, which is commonly used in atomic clocks.
The first Bose-Einstein condensate including this element, one of three metals which is liquid at room temperature, was observed at 45 nanokelvin in October 2002.  
cesium