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The element fluorine is a greenish yellow gas.
The element fluorine is a greenish yellow gas. This a simulant, showing how fluorine appears (though the actual gas would be less intensely colored in small volumes). The real element would corrode even borosilicate glass.Original author unknown, Creative Commons License (Wikipedia)
This diagram shows the electron shell of a fluorine atom.
This diagram shows the electron shell of a fluorine atom.Greg Robson, Creative Commons License
Pure fluorine is a corrosive pale yellowish brown gas.
Pure fluorine is a corrosive pale yellowish brown gas.RTC, wikipedia.org