PLEASE HELP CHEMITRY! What happens to the binding energy of lighter elements when they undergo fusion?

What is the most stable nucleus (the one with the highest binding energy)?

What happens to the binding energy of elements like uranium when they undergo fission?

Why does the fusion of elements beyond iron in our universe require a supernova? Use this diagram to explain your answer.

1) In fusion reactions, two light atomic nuclei fuse together to form a heavier nucleus. In doing so, they release a comparatively large amount of energy that arises from the binding energy, creating an increase in temperature of the reactants.

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3) When a large, fissile atomic nucleus such as uranium-235 or plutonium-239 absorbs a neutron, it may undergo nuclear fission.  However, one neutron does collide with an atom of uranium-235, which then splits and releases two neutrons and more binding energy.

4) Iron cannot release energy by fusion because it requires a larger input of energy than it releases.  This energy blows the outer layers of the star off into space in a giant explosion called a supernova (plural: supernovae.)

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