In the atmosphere of what non-metal does water burn with a bright flame?

Fluorine can become such a non-metal:
2F2 + 2H2O → 4HF + O2
F2 + H2O → 2HF + [O]
Here, there is a reaction of interaction of fluorine and water with the formation of hydrogen fluoride and oxygen. As a result of the reaction, atomic oxygen is formed. This composition was previously used in phosphorus bombs.



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