The farther you go in the number of protons from iron bigger or smaller, the more it wants to be iron. If you go toward the end of the scale (uranium, plutonium, larger) or the other end (hydrogen,helium,) it’s easiest to coax it into becoming more like iron. This releases energy. When stars run out of fuel, even if it’s so large it squeezes anything into iron, they explode and create larger particles than iron, but the reason they exploded is cuz the hydrogen and helium and lithium and whatever else turned into a puck of iron that is too stable and it all falls apart.
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