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The pair that is different from the others is B-Al. This is because B (Boron) and Al (Aluminum) are both non-metals or metalloids, whereas Li (Lithium), Mg (Magnesium), Na (Sodium), K (Potassium), and Ca (Calcium) are all metals. The other pairs consist of metals only, while B and Al represent a different category of elements.

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4mo ago

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