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JEE Main & Advanced Chemistry Structure of Atom / परमाणु संरचना Question Bank Atomic number, Mass number Atomic species

  • question_answer
    The nucleus of an element contain 9 protons. Its valency would be                          [MP PET 2004]

    A)                 1             

    B)                 3

    C)                 2             

    D)                 5

    Correct Answer: A

    Solution :

                    Since its nucleus contain 9 proton so its. atomic number is 9 and its electronic configuration is 2, 7. So it require one more electron to complete its octet. Hence its valency is 1.


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