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Why do atomic clocks use caesium rather than another dense metal atom? Is there something special about caesium? Presumably the clocks could be made more cheaply if something cheaper - like the "gold" on sale in my local market - were used instead?Chris
In fact, time is defined in the International System of Units on the basis of the transition of cesium-133 atom. A second represents the time required by a cesium-133 atom to emit 9,192,631,770 cycles of radiation while suffering a transition between two levels of energy."http://www.nist.gov/public_affairs/releases/logic_clock/logic_clock.html [nofollow]