Sentence Examples


  • Subsequent clocks used cesium (an alkaline electropositive metal) to function, resulting in the 1958 release of the first commercial atomic clock available at a cost of $20,000.
  • Matthiessen, sodium ranks fourth to silver, copper and gold as a conductor of electricity and heat, and according to Bunsen it is the most electropositive metal with the exception of caesium, rubidium and potassium.