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Uses of Halogens (Group 7) - Coggle Diagram
Uses of Halogens (Group 7)
Fluorine
It is a pale yellow-green poisonous gas.
It is found in combination with calcium in the mineral fluorite.
Fluorite contains fluorine and glows weakly when ultraviolet light is shown on it, this property is called fluorescence.
One variety of fluorite is called Blue John and is carved to make jewellery and ornaments.
It combines with water to form hydrogen fluoride, which dissolves glass and is used in etching glass surfaces.
Sodium fluorite is used to prevent tooth decay and is added to some drinking water supplies.
Fluorine is one of the elements of chlorofluorocarbons or CFCs.
Chlorine
Chlorine is a yellow-green poisonous gas.
It is found with combination with sodium in rock salt.
Chlorine is used to kill bacteria in water supply systems.
It is also used in the manufacture of bleach.
It forms hydrochloric acid which has many uses in the industry.
Bromine
It is a red-brown liquid which produces a poisonous, strong-smelling brown vapour at room temperature.
It is extracted from bromine salts in seawater.
It’s used with silver in traditional photography.
Silver bromide is light sensitive and is used in photographic films to record the amount of light in different parts of the image focused by the camera lens.