Find the odd one out. Give a reason for your answer.
Hydrogen, Oxygen, Nitrogen, and Helium

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Solution

The given elements are found in the gaseous state in nature.
Out of these, Hydrogen, Oxygen, and Nitrogen are considered non-metals because all of these elements require electrons to attain a stable noble gas configuration.
While, Helium is an inert gas and belongs to the noble gas family. It is so because Helium has a completely filled valence shell that makes it inert to chemical reactions.
Hence, the odd one out is Helium.

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