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  5. Atoms and Molecules

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

  • question_answer
    Symbol of nucleus with atomic number 18 and mass number 40 is written as:

    A) \[_{18}^{40}R\]                      

    B) \[_{18}^{40}Ar\]

    C) \[_{40}^{18}Ar\]         

    D)        40 Ar 18

    E) None of these

    Correct Answer: B

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