The heaviest naturally occurring and stable element in the world is Uranium-238, which contains 92 protons and electrons and 146 neutrons. There are a number of other elements that can be created in laboratories or under hypothetical situations. These are very unstable and cannot last very long, which has caused some controversy.
The heaviest element that has ever been created and observed is ununoctium, the temporary name for the atom with the atomic number 118.
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