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The heaviest stable element is bismuth, atomic number 83, atomic weight 208.9804). Any heavier element is radioactive, which means it decays into lighter elements - uranium, the heaviest naturally occurring element, will eventually decay into lead-207.

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8y ago
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13y ago

Natural element - Uranium at 238.103 amu

However it is unknown how far the table can be taken with synthetic elements.

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11y ago

The heaviest element in the Periodic Table (known in March 2013) is ununoctium.

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8y ago

Ununoctium is the heaviest element, but it is man-made. The heaviest naturally occurring element is uranium (atomic number 92, atomic weight 238.0289).

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6y ago

Osmium and iridium

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11y ago

osmium and iridium

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Q: What is the heavist element in the periodic table?
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