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9th Class Science Structure of the Atom Question Bank Structure of the Atom

  • question_answer
    What is the ratio of the neutrons present in carbon and silicon atoms with respect to their atomic masses? (Atomic mass of carbon and silicon are \[12\] and \[28\] respectively)

    A) \[3:7\]                 

    B)        \[7:3\]

    C) \[3:4\]                           

    D) \[6:28\]

    Correct Answer: A

    Solution :

     The atomic number of carbon is \[6\] and mass number is \[12\,\,i.e.\,\,Z=6\] and\[A=12\] Number of neutrons\[=A-Z\]             \[=12-6=6\] The atomic number of silicon is 14 and the mass number is\[28\,\,i.e.\,\,Z=14\]and\[A=28\] The number of neutrons\[=A-Z=28-14=14\] The ratio of the number of neutrons of carbon and silicon\[=6:14\]or\[3:17\]


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