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 Shade, the Changing Man Shade, the Changing Man is a fictional comic book character created by Steve Ditko for DC Comics in 1977. The character was later adapted by Peter Milligan and Chris Bachalo in one of the first Vertigo titles. Both versions of Shade are distinct from the Shade, another DC Comics character. "Shade, the Changing Man" told the story of a fugitive from the militant planet Meta in another dimension. Shade (whose full name is Rac Shade) was powered by a stolen "M-vest" (or Miraco-Vest, named for its inventor) which protected him with a force field and enabled