1. The problem statement, all variables and given/known data Find which of the α and β decays are allowed for 223Ac. (Determine the disintegration energy Q for each decay which is allowed, and calculate the binding energy B against each decay which is not allowed.) 2. Relevant equations Q=(Parent mass-Daughter mass-alpha particle mass)c^2 3. The attempt at a solution I think that it will decay to francium 219. well, i looked up the masses i needed, did the subtraction, and got an answer of 7.80482211 MeV which is wrong. I need some help on the right answer. I did it again and got 6.78313995 MeV i need to know if this is right. GOT IT :) I guess i didn't need help after all.