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No best answer has yet been selected by MargeB. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ.Pretty good kags...
Actually when a star above a certain mass tries to produce iron which as you point out consumes more energy that it supports there is nothing supporting it any more and it collapses in on itself...violently, very very violently. This produces conditions where pretty much all possible elements are produced (including a lot of iron).
These Supernovas are bright, but relatively rare. There's not been one in our galaxy since the invention of the telescope but during their occurence they produce more energy than the rest of the galaxy put together - lts say you wouldn't want to be standing nearby!
Our solar system will have been formed out of the debris of an earlier star that went Supernova, during the period of planet formation the earth was effectively molten from all the bombardment so heavier elements like Iron, Gold Uranium etc sank deeper inside