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The deviation of atomic numbers from mass numbers is given as a number that directly corresponds to the severity of the reactions of an element’s isotopes to nuclear fission and fusion. Nuclear fission produces energy in elements heavier than iron, and absorbs energy in elements lighter than iron.

If nuclear fusion has an effect on isotopes that is equal to the negative value of fission’s effect on the isotope, then it must be true that:

elements lighter than iron never produce energy.
nuclear fission and fusion do not affect iron’s isotopes.
the deviation of an element’s atomic number from its mass number is a constant.
the deviation of iron’s atomic number from its mass number is zero.
elements heavier than iron do not respond to nuclear fusion.