Jacques-Louis Soret
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Jacques-Louis Soret (June 30, 1827 – May 13, 1890) was a Swiss chemist who co-discovered holmium in 1878 with Marc Delafontaine and independently in 1879 with Per Teodor Cleve.
He was also responsible for correctly working out the chemical composition of Ozone as being 3 oxygen atoms, bound together.