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Question
What is isotope? Give an example.
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Solution
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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