Robert Hooke, Ole Borch, Mikhail Lomonosov, and Pierre Bayen all produced oxygen in experiments in the 17th and the 18th century but none of them recognized it as a chemical element.
Robert Hooke, Ole Borch, Mihhail Lomonossov ja Pierre Bayen said kõik 17. ja 18. sajandil katsetes hapnikku, kuid flogistoniteooria valitsemise tõttu ei näinud keegi selles keemilist elementi.