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Gold – Speaking to Andrea Sella, a chemistry professor at the University College London, a BBC correspondent determined the main reason why gold is so valued: it is one of only eight elements (along with platinum, palladium, rhodium, iridium, osmium, ruthenium, and silver) that barely react with all of the other elements. Also, as opposed to silver, gold doesn’t tarnish, which is another important criterion for a metal to be considered for use as valuable currency.