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  4. Assertion: Isotopes of an element can be separated by using a mass spectrometer. Reason: Separation of isotopes is possible because of the difference in electron numbers of isotopes.

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Q. Assertion : Isotopes of an element can be separated by using a mass spectrometer.
Reason : Separation of isotopes is possible because of the difference in electron numbers of isotopes.

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Solution:

Isotopes have same number of electrons and protons but different neutron number. That’s why the mass number of isotopes are different and can be separated by using a mass spectrometer.