LONGEST LIVED HALF-LIFE


HALFLIVES of ELEMENTS with LONGEST LIVED ISOTOPES
For the heaviest elements, the halflives of the longest lived isotopes decrease by more than 22 orders of magnitude in going from element 90 (thorium) to element 112 (unnamed). Thorium-232 has a halflife of 14.1×109 years whilst that of element 112-277 is just 400 microseconds.