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

  • question_answer
      Predict the valency of the following elements (i) A (Atomic number 5)     (ii) B (Atomic number 12) (iii) C (Atomic number 14)    (iv) D (Atomic number 17)         

    Answer:

                      (i) Valency of element 'A' = 8 - 5 = 3                                      (ii) Valency of element 'B' = 12 - 10 = 2                                    (in) Valency of element 'C' = 14 - 10 = 4                                     (iv) Valency of element 'D' = 18 - 17 = 1       


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