The second lightest gas. one word answers
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Helium is the second lightest gas with lowest boiling point.
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Helium
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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