Period 3 element in 1810, who named it chlorine, from the Greek word χλωρος (chlōros), meaning "green-yellow." Chlorine is a component of various compounds, including table salt. It is the second most abundant halogen and 21st most abundant chemical element in Earth's crust. The great oxidizing potential of chlorine led it to its bleaching and disinfectant uses, as well as uses of an essential reagent in the chemical industry. As a common disinfectant, chlorine compounds are used in swimming pools to keep them clean and sanitary. In the upper atmosphere, chlorine-containing molecules such as chlorofluorocarbons have been implicated in ozone depletion. "Argon" (symbol
Shade, the Changing Man (Vertigo) Shade, the Changing Man (Vertigo) Shade, the Changing Man is an American superhero comic book featuring the character of the same name. The series was written by Peter Milligan and published by DC Comics; it lasted for 70 issues, from July 1990 to April 1996. The final 37 issues were published under the company's Vertigo imprint for mature readers. "Shade, the Changing Man" chronicles the adventures of Rac Shade, an alien from the planet Meta who becomes stuck in the body of Troy Grenzer, a convicted serial killer. The series' long-term story arc focuses on the relationship between Shade and