Is Uranium the heaviest element? How heavy is it?
The heaviest element that is named is Meitnerium… http://www.chemicalelements.com/elements/mt.html weighing in at 266 for molecular weight. There are more elements that weight greater than that but they have no names at this stage. Uranium weighs in at 238, with the isotope 235 being one of interest in terms of nuclear issues.