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  5. Atoms and Molecules

9th Class Science Atoms and Molecules Question Bank Atoms and Molecules

  • question_answer
    Number of atoms in 69 g of Na is :

    A) \[1.0\times {{10}^{24}}\] atoms of Na

    B) \[1.80\times {{10}^{24}}\] atoms of Na

    C) \[6.023\times {{10}^{24}}\] atoms of Na

    D) \[1.5\times {{10}^{23}}\] atoms of Na

    E) None of these

    Correct Answer: B

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