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BaBr2 has bonds that are primarily ionic because the electronegativity between Ba and Br is very large. This is because Ba is in Group 2 of the periodic table and Br is in Group 17. Following the electronegativity trend (electronegativity increases across the periodic table), we can see that there is a very large electronegativity difference between Ba and Br. Ba is also lower than Be on the periodic table, and because electronegativity decreases going down the periodic table, the electronegativity difference between Ba and Br will be greater than the electronegativity difference between Be and Br.
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