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Punjab Medical Punjab - MET Solved Paper-1999

  • question_answer
    The number of electrons and neutrons of an element is \[18\] and \[20\] respectively. Its mass number is

    A) \[37\]                                   

    B) \[38\]

    C) \[9\]                                     

    D) \[22\]

    Correct Answer: B

    Solution :

    Here: Number of electrons or protons\[=18\]  and number of neutrons\[=20\]. We know that mass number = No. of electrons or protons + number of neutrons\[=18+20=38\].


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