Is xenon (xe) more or less reactive than bromine (br)? why?

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Explanation:

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Less. It is a noble gas. Its outer shell is completely filled. It is stable and will, under normal conditions, not accept or give any of its electrons. Bromine, however, only has 7 electrons in its outer shell, so it will try to fill its shell by bonding with another atom.

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alchemy hadn't scientific methods of study, appeal to mysticism and fantasy, the knowledge of chemistry and physics were modest at that time.

alchemy was - but as new rules were discovered it either changed into chemistry or it became "unscientific".