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10th Class Science Periodic Classification of Elements

  • question_answer 81)
      Which of the given elements A, B, C, D and E with atomic number 2, 3, 7, 10 and 30 respectively belong to the same period? (a) A, B, C                            (b) B, C, D                            (c) A, D, E                             (d) B, D, E

    Answer:

                      (b) 2ndperiod contains elements with atomic number 3(Li), 7(N), 10(Ne). Since, 2nd period has elements having atomic number 3 to 10,


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