The noble gas that does not have a closed octet in its outer shell is:

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Solution

The noble gas which do not have a complete octet in its outer shell is Helium, since it has only 2 electrons in its outermost shell.

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

The noble gas that does not have a closed octet in its outer shell is:

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