Answer:
a structural variation in which different atoms of the same element have different numbers of neutrons
Explanation:
An isotope is an atom of an element having the same number of protons but different number of neutrons. Different isotopes are used for different purposes. Example: some are used in medicines , food irradiation, etc.
Carbon has three isotopes C 12, C 13, C 14. All three of them have 6 protons but have different numbers of neutrons.
C 12 is a common element and is abundant in nature
C 13 is less abundant than C 12
C 14 is used for dating fossils . It is radioactive
The best description of an isotope is; a structural variation in which different atoms of the same element have different numbers of neutrons
Isotopy is a property of elements in which atoms of the same element have the same atomic number, occupy the same position in the periodic table but have different mass numbers by virtue not their differing number of neutrons in the nuclei.
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