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10th Class Science Metals and Non-metals / धातु और अधातु Question Bank 10th CBSE Science Metals and Non-metals

  • question_answer
          An element E combines with  to form an oxide , which is a good conductor of electricity. Answer the following (a) How many electrons will be present in the outer most shell of E? (b) Write the formula of the compound formed when it combines with chlorine.

    Answer:

                      (a) Valency of the element E is 1.                       This means that it has only on electron in the valence   shell.                                                  (1)    (b) Valency of Cl is 1 and while that of £ is 1.    CD Therefore, the formula will be ECl.                 (1)  


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