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  3. 9th Class
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  5. Structure of the Atom

9th Class Science Structure of the Atom Question Bank 9th CBSE Science Structure of the Atom

  • question_answer
         Helium atom has 2 electrons in its valence shell but its valency is not 2.  Explain.         

    Answer:

                      Helium atom has 2 electrons in its valence shell and its duplet is complete. Hence, the valency is zero.


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