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10th Class Science Periodic Classification of Elements Question Bank Periodic Classification of Elements

  • question_answer
    Three elements P, Q and R have consecutive increasing atomic numbers. If Q is a noble gas then which of the following is correct about P and R?

    A) P and R belong to the same period of the periodic table.

    B) P is a non-metal while R is a metal

    C) P and R belong to same group of the periodic table.

    D) None of these

    Correct Answer: B

    Solution :

    P, Q and R have consecutive increasing atomic numbers. As noble gases are present at the end of each period, P must be a non-metal of the same period and R must be a metal of the next period.


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