(a) Use the semiempirical mass formula to evaluate the points on the A = 27 mass parabola for the only three values of Z that are found with this value of A, namely Z = 12, 13, 14. (Hint: It is only necessary to evaluate the terms of the formula that depend explicitly on Z.)
(b) Which value of Z corresponds to the stable nucleus?
(c) Find the types of decay, and the decay energies, for the β decays of the two unstable nuclei.