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
A Whiter Shade of Pale Shade of Pale" at Olympic Sound Studios in London, England. The recording was produced by Denny Cordell. Because they did not have a regular drummer, the drums were played by Bill Eyden, a session musician. The track was completed in two takes, with no subsequent overdubbing. A few days after the session, the band re-recorded the song with their newly recruited drummer, Bobby Harrison, at Advision Studios. This version was discarded, and one of the original mono recordings was chosen for release as the band's debut single. The B-side was "Lime Street Blues", another Brooker–Reid song, which the band recorded