Radium 226 atomic mass 226 03 the only naturally occurring

Last updated: 5/3/2023

Radium 226 atomic mass 226 03 the only naturally occurring isotope of this element follows the decay sequence shown below a 3 10 min 214 Pb a 3 82 day 218 Po a 1602 y 222 Rn 226 Ra Each step occurs by alpha emission The half life for each step is shown below the arrow How many years would it take for a 1 56 g sample of 226Ra to produce 13 34 mL of helium measured at 27 C and 674 torr following this decay sequence