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

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    The mass number of an anion, \[{{X}^{3-}}\], is 14. If there are ten electrons in the anion, the number of neutrons in the nucleus of atom, \[{{X}_{2}}\] of the element will be [MP PMT 1999]

    A)                 10          

    B)                 14

    C)                 7             

    D)                 5

    Correct Answer: C

    Solution :

                    \[_{7}{{X}^{14}},\,n=14-7=7\]


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