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    Question

    Which of the following is true about

    isotopes?
    A Same number of protons and neutrons Correct Answer Incorrect Answer
    B Same number of protons but different number of neutrons Correct Answer Incorrect Answer
    C 1Same number of electrons and neutrons Correct Answer Incorrect Answer
    D None of the above Correct Answer Incorrect Answer

    Solution

    Isotopes are defined as elements having same number of protons and different number of neutrons. Since the number of protons is equal to the number of electrons. Therefore, number of electrons are also same in isotopes. Example of isotopes include hydrogen and deuterium. Hydrogen contains 1 proton, 1 neutron and 1 electron whereas deuterium contains 1 proton,2 neutrons and 1 electron. Hence, option B is correct.

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