The correct statement about metals and nonmetals is:
Metals can be hammered into thin sheets, and nonmetals are brittle.
Let's briefly examine why the other statements are incorrect:
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Metals tend to be poor conductors of electricity, while nonmetals are strong conductors of electricity. - This is incorrect because metals are generally excellent conductors of electricity, while most nonmetals are poor conductors.
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Most metals are a solid under normal conditions, and most nonmetals are a liquid. - This is incorrect because while most metals are solid at room temperature, most nonmetals are gases at room temperature, not liquids.
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Metals and nonmetals can both be found in any column of the periodic table. - This is incorrect as metals are primarily found on the left side and in the center of the periodic table, while nonmetals are found on the right side.
Therefore, the second statement is the only correct one in the context provided.