Silcon-28 has a mass-per-nucleon of 1.003 amu. Iron-56 has a mass-per-nucleon of 0.99723 amu. Cadmium-112 has a mass-per-nucleon of 1.004 amu. Which would release more energy per nucleon involved: fusion two silicon atoms into one iron atoms or fusing two iron atoms into one cadmium atom? Why?