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Elements with same atomic number but different atomic masses are called isotopes. For example; hydrogen and duterium are isotopes.
An isotope is one of two or more species of atoms of a chemical element with the same atomic number and position in the periodic table and nearly identical chemical behavior but with different atomic masses and physical properties. Every chemical element has one or more isotopes.
Same atomic number but atomic mass are not sameExample : boron has two isotope in nature
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