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
Shades of green a shade of greyish green in the classic range of colours of the German RAL colour standard, where it is colour 6011. The name derives from the colour of the leaves of "Reseda odorata", commonly known as mignonette. "Sap green" is a green pigment that was traditionally made of ripe buckthorn berries. However, modern colors marketed under this name are usually a blend of other pigments, commonly with a basis of Phthalocyanine Green G. Sap green paint was frequently used on Bob Ross' TV show, "The Joy of Painting". "Shamrock green" is a tone of green that represents the color