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Isotopes are two or more types of atoms that have the same atomic number which is the number of protons in their nuclei and position in the periodic table and hence belong to the same chemical element, and that differ in nucleon numbers and mass numbers due to different numbers of neutrons in their nuclei. While all isotopes of a given element have almost the same chemical properties, they have different atomic masses and physical properties.
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what is ISOTOPES
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Atoms of an element with same atomic number but different mass numbers are called isotopes.
or
Atoms of an element with different numbers of neutrons are called isotopes.
According to Dalton's atomic theory atoms of an element are similar in all respect.

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