Noble gases are inert, that is, under normal conditions they do not react. Which of the following is not a noble gas?

Neon

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Lithium

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Helium

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Argon

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Solution

The correct option is B Lithium
Lithium is not a noble gas. In order to be a noble gas, an element must have all its valence orbitals filled in neutral atom state like helium just has $1 s$ -orbital in its outer shell which is fully filled with two electrons, hence helium is a noble gas. In case of hydrogen, it has one electron in its valence orbital, i.e., partially filled valence shell, hence it's not a noble gas.

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Similar questions

Noble gases are inert and do not form compounds like other elements because of their:

Statement I: $^{20} N e$ and $^{22} N e$ are isotopes.
Statement II: Noble gases do not exist as isotopes as they are inert.

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