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Railways R.R.C. (Delhi) Solved Paper Held on 1st Shift 2-11-2014

  • question_answer
    How many periods (horizontal columns) and groups vertical columns) are there in Mendeleefs periodic table?

    A) Seven and eighteen

    B) Eight and eighteen

    C) Eighteen and seven

    D) None of these

    Correct Answer: D

    Solution :

    There are 7 periods and 18 groups in Mendeleef's periodic table.              


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