Step 1 : Introduction to the question "Which naturally occurring element is heaviest by atomic weight?"
...There are several elements which sport a high atomic weight. The heaviest element is the one with the largest number of protons in its atomic nucleus. At present, ununoctium is the heaviest but it's man-made, and so disqualified as a "naturally" occurring element. When looking at naturally occurring elements, uranium takes the title of heaviest natural element with an atomic number of 92 and an atomic weight of 238.0289. If you consider heaviness as a property of density, defined as mass per unit volume, then osmium and iridium are the heaviest. But when measuring by atomic weight, uranium takes the prize as heaviest. Source: ThoughtCo.com
Step 2 : Answer to the question "Which naturally occurring element is heaviest by atomic weight?"
Uranium:
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According to the Guinness World Records, in 1971, a US Scientist - Darleanne Hoffman, discovered small amounts of Plutonium-244 in Southern California, making this the heaviest naturally occurring element by atomic weight.
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