atomic number 43


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Noun1.atomic number 43 - a crystalline metallic element not found in natureatomic number 43 - a crystalline metallic element not found in nature; occurs as one of the fission products of uranium
metal, metallic element - any of several chemical elements that are usually shiny solids that conduct heat or electricity and can be formed into sheets etc.
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Had you proposed to any chemist sixty years ago that, during 1994, more than 15 million hospital patients in more than 8000 hospitals and clinics worldwide would be injected with a solution containing an isotope of element atomic number 43, you would probably have been considered as more than slightly deranged