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Question

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


A

Argon

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B

Helium

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C

Krypton

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D

Neon

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Solution

The correct option is B

Helium


The atomic number of Helium is Z = 2. The electronic configuration is, 2. Therefore, Helium is a noble gas with two valence electrons.


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