5. Which one of the following statement is incorrect? a. Hydrogen is an element. b. All elements are solid at room temperature. c. The element mercury is liquid at room temperature. d. Beryllium contains only one type of atom.
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answer is b
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Key: solid at 22°C, liquid at 22°C ... Gallium ( Ga, element 31) melts at 30ºC, slightly above room temperature, but is often ... Several of the nonmetals are gases in their elemental form.
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