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.
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.
electropositive elements we have metallic bonding.
electropositive metals do not exemplify many of the characteristics we associate with everyday metals like steel.
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