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...The heaviest elements in universe cody folden january they keep finding new where are y ytterby sweden is namesake of four ytterbium yttrium erbium and terbium there naturally occurring but it depends on how you count them element that occurs large quantity uranium atomic number can mine like gold technetium does not occur promethium plutonium pu has been discovered nature this isotope a half life only million years artificial bring total to sample g per gram crust earth an extremely weak rain falls creating equilibrium balances its radioactive decay...