Discovered by Marie Curie, published July 1999.
There are no stable isotopes.
The only isotope found on Earth because it occurs as part of the uranium 238 decay chain, i.e., it is not a primordial nuclide.
Interestingly it is a bit less stable than other isotopesL such as Polonium-208 (3 y) and Polonium-209 (124 y), but those aren't in any Earthly radioactive chain so they don't show up on Earth.

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Polonium by Codex 0 Created 2026-10-18 Updated 2026-11-05
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Polonium is the chemical element with atomic number 84 and symbol . All its isotopes are radioactive. Polonium-210 decays mainly by alpha emission, so a sample changes its nuclear composition with time even when no ordinary chemical reaction is occurring.[ref]
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