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Question

______ is the only noble gas which does not have 8 electrons in its outermost orbit.

A
Neon
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B
Krypton
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C
Argon
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D
Helium
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Solution

The correct option is D Helium
Helium is a noble gas with atomic number(Z) = 2 and has the same number of electrons in its valence shell as well. It is said to have a duplet of electrons instead of the octet.

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