1.

Match the following helium with second lightest gas

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ANSWER:

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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