1. The problem statement, all variables and given/known data 1)Neutron emission is not a possible mode of decay for K(40,19).Why? 2. Relevant equations 3. The attempt at a solution I think it is because the neutron to proton ratio for potassium(40,19) is almost unity(more precisely N/P=1.1). So, neutron emission is not a mode of decay to gain stability. Is it right?