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Hi there.
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In this problem, we have the oxides of two alkaline earth metals.
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So real quickly, i just want to write down the group two elements.
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So the alkaline earth metals start with beryllium.
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Then we have magnesium going down the periodic table.
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Calcium, strontium, barium, and the ra, finishing out the group.
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All right, in this problem, we are interested in the oxide made with mg and comparing it to the oxide made with b .a.
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Being that these are oxides, they will react with water to make the hydroxide.
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In other words, a base.
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As hydroxide ions tell us it is a base.
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The baryam will do the same thing.
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We're trying to figure out which one is going to be more basic...