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प्रश्न
What is isotope? Give an example.
उत्तर
Isotopes are atoms of the same element having the same atomic number Z, but different mass number A. For example, hydrogen has three isotopes and they are represented as \[\ce{_1^1 H}\] (hydrogen), \[\ce{_1^2H}\] (deuterium), and \[\ce{_1^3H}\] (tritium).
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