Which of the following elements is a solid at room temperature and pressure?
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A.
Mercury
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B.
Sodium
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C.
Oxygen
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D.
Hydrogen
Correct Answer:
B. Sodium
Explanation:
At standard temperature and pressure, sodium is a solid metallic element. In contrast, mercury is a liquid metal, while oxygen and hydrogen are gases. Sodium's atoms are arranged in a stable crystalline structure under these conditions, giving it a fixed shape and volume characteristic of the solid state.
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