Question

Why noble has have only two electron in its valence shell​

Answer 1

Answer:

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No only helium have 2 valence electron ...

Argon have 8 valence electron .It is also a noble gas.

They have complete filled valence shell they neither gain or loss electrons.

Explanation:

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Answer 2

•Nobel gas generally has 8 electrons in in its valence shell.
•Having 8 electrons in valence shell increase stability.
•This is known as a octet.
•Helium is an Exception as it have 2 electrons in its valence shell.
•This is known as duplet.