Hello there! First of all, I couldn't find this topic around here but I could be blind, so if the answer is posted somewhere else, just leave me the link as a response, thank you! I am trying to figure out few things about where the heaviest elements come from. I know that Iron is the heaviest one created in a star, and then with the supernovas we get until uranium and plutonium (not quiet sure which one, I would like to know if plutonium is a result of uranium decay or is created in a supernova as well :uhh:). In the periodic table, after plutonium, you can find few other actinoids: Are they created artificially or did they exist in nature but they decayed here in earth long time ago and we can't find them nowadays? Or do we actually find them somewhere in nature? And about the rest of elements after the last of the actinoids, are they artificial? and why are they classified as "unknown chemical properties"? I was discussing with a friend some time ago about creating a new element that doesn't exist naturally; he thought it was impossible, but as far as I know it is possible. Or am I wrong? I heard somewhere that some elements' life are so short because they are very unstable. Are these the ones in the category "unknown chemical properties"? Is that why we can't find them in nature or they just created in a lab? Thanks a lot for any answers, and excuse my poor knowledge about this subject, really!