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

  • question_answer
      An element -X' has mass number 4 and atomic number 2. Write the valency of this element. Will it react with other atoms of different  elements?

    Answer:

                      We know that only valence electrons take part in bond formation with afferent atoms. In the atom of 'X' element there are only two electrons atomic number is 2. Thus, K shell is fully filled for this atom. Hence, its valence is zero. It will not react with other atoms of different elements,   


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