I believe the correct answer is C, but I'm 100% on this. Hope this helped though!
-TTL
it is equal to the potential energy of the products
All phosphorus atoms have the same atomic number. Hope i helped
The decay mode of cesium-137 is beta decay. This means that the cesium-137 decays into a beta particle and a nuclide with the same mass number, but with a charge number that is 1 more than that of cesium.
Therefore, this means Cs-137 decays into an electron and Barium-137, meaning the answer is choice 1.