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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:

      Atomic number of helium is 2. K is its valence shell, so it can accommodate only 2 electrons (maximum capacity). It means that its valence shell is complete. So, its valency is zero instead of two.  


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