The heaviest element that occurs naturally on earth is Uranium (atomic weight 238 or 235 depending on the isotope). Scientists can create atoms heavier than Uranium in the lab but they are usually very short lived (the half life in some is less than a few seconds). But, the most recent of these types of man made elements is not only the heaviest, but also the most stable. It is called Mendelevium with an atomic weight of 256 and has a halflife of over 2 months.
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