Out of the following elements, which is/are inert gas(es)?

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Helium

Argon

Sodium

Both 1 and 2

answer is D.

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Detailed Solution

Helium and Argon are inert gases.
Helium (He) and argon (Ar) are inert gases. They are noble elements with a completely filled subshell having 8 electrons in their valence shell. Since these gases have a stable electronic configuration, they are unreactive by nature and do not have tendency to gain or lose electrons.

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