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Up until "with oxygen" you were doing so well, though it should be emphasized that while halogens are quite reactive generally, halons are pretty inert.

Halons which reach the upper atmosphere could break down under ultraviolet light, releasing halogen radicals, for which "highly reactive" is far too mild a term. However, they don't really do much with diatomic oxygen (though they do catalyze the decomposition of ozone into diatomic oxygen).

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