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fluorine（physical properties) -pale yellow, white or colourless gas -In liquid form it is freely soluble in liquid oxygen and ozone -changes from a gas to a liquid at a temperature of -188.13°C -changes from a liquid to a solid at -219.61°C
oxygen（physical properties） -Colorless -changes from a gas to a liquid at a temperature of -182.96°C when it takes on a slightly bluish color -Liquid oxygen can then be solidified or frozen at a temperature of -218.4°C -Oxygen is an odorless gas
nitrogen（physical roperty） -gas without any color, taste and also without any smell which is one of the physical property of nitrogen. -relatively considered as inert gas which is one of the physical property of nitrogen. -considered as the liquid which is similar to water in appearance. -The melting point is -2100C. -The boiling point is -195.80C. -Nitrogen has the soluble property; it is less soluble in water
fluorine uses Anti-reflective coatings contain compounds of fluorine. Fluorine can be used for plasma etching, flat panel display and MEMS (microelectromechanical) fabrication. HF (hydrofluoric acid) is used to etch glass, usually in light bulbs.
oxygen Uses -For breathing (e.g.use oxygen cylinder when we dive in water） -for medical use (e.g.Nasal cannula,oxygen mask) help patients with breathing difficulties
nitrogen -unreactive Uses -use in food packaging(pevent the food from going bad) -as a refrigerant(liquid nitrogen) -making ammonia(fertilizers)
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