Bismuth was formerly understood to be the element with the highest atomic mass whose nuclei do not spontaneously decay. However, in 2003 it was found to be very slightly radioactive. The metal’s only primordial isotope, bismuth-209, undergoes alpha decay with a half-life roughly a billion times longer than the estimated age of the universe.
wow. that must be the slowest process of anything in the universe
edit: nvm
The slowest process measured is the radioactive decay of Xenon-124, with a half-life trillions of times longer than the universe’s age, making it the longest-lived observed phenomenon.
Huh. No shit.
wow. that must be the slowest process of anything in the universe
edit: nvm
Coincidence?
*X-Files theme starts playing*