Radiation!
Chemistry
Level
pending
What is the heaviest stable isotope?
U-238
U-235
Pb-207
Ra-226
Pb-208
Bi-209
Po-210
Ra-227
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1 solution
Although Bi-209 was previously thought to be stable, it actually has a half-life of 1 . 9 × 1 0 1 9 years.