helium is an _ gas
_ is a liquid metal
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Helium (He), chemical element, inert gas of Group 18 (noble gases) of the periodic table. The second lightest element (only hydrogen is lighter), helium is a colourless, odourless, and tasteless gas that becomes liquid at −268.9 °C (−452 °F).
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Answer:
Helium is an inert gas.
Mercury is a liquid metal.
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