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You can tell that Hbr is especially strong because Br is a halogen, meaning that it already wants to shed a hydrogen proton so it can gain an electron and become isoelectric with krypton. Br also has a relatively low electronegativity compared to other halogens like fluorine, so it holds less tightly onto the hydrogen (which it already wants to get rid of). Both of these factors combine to result in a compound (HBr) that readily gives off a proton in solution and does not want to return to its original state, classifying it as a strong acid.
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