At higher temperatures, boron does burn in air to form boron(III) oxide, B2O3. 
Reactions with halogens 
Boron reacts vigorously with fluorine, chlorine, and bromine to form boron(III) trihalides. 
Reactions with acids 
Crystalline boron does not react with boiling hydrochloric acid (HCl) or boiling hydrofluoric acid (HF). Powdered boron oxidizes slowly when treated with concentrated nitric acid, HNO3.

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