Ozone, the first allotrope of a chemical…
1840 CE
Ozone, the first allotrope of a chemical element to be recognized by science, is proposed as a distinct chemical compound by German-Swiss chemist Christian Friedrich Schönbein in 1840, who names it after the Greek word for smell (ozein), from the peculiar odor in lightning storms.
The formula for ozone, O3, will not be determined until 1865 by Jacques-Louis Soret and confirmed by Schönbein in 1867.