Question
What are isotopes? Give one example.
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Answer
The atoms of the same element which have the same atomic number $Z$ but differ in their mass number $A$ are called isotopes.
Example: Hydrogen has three isotopes Protium ${ }_1^1 H$, Deuterium ${ }_1^2 H$, and Tritium ${ }_1^3 H$.
Example: Hydrogen has three isotopes Protium ${ }_1^1 H$, Deuterium ${ }_1^2 H$, and Tritium ${ }_1^3 H$.
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