Each of the following noble gas has eight electrons in the valence shell except:

neon

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argon

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krypton

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helium

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Solution

The correct option is D helium
Helium has electronic configuration ${n s}^{2}$ so it has two electrons in its valence shell and it is different from other noble gases.

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Similar questions

Which one of the following elements has two valence electrons but is a noble gas?

The noble gas having only two electons in its valence shell is:
(a) Ar (b) Ne (c) He (d) Kr

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