Which is not a type of element?

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Elements are classified by their properties into metals, nonmetals, and metalloids, which describe how they behave chemically and physically. Gases describe a state of matter—how a substance exists at a given temperature and pressure—not a classification of the element itself. Some elements are gases at room temperature, some are liquids, and some are solids, so labeling “gases” as a type of element mixes state with elemental category. Therefore, gases is the term that is not a type of element. Metals, nonmetals, and metalloids are the true elemental classifications.