Definition - Isotopes
Isotopes are the atoms of the same element with different masses are known as isotopes
Example -: Carbon-12, Carbon-13, Carbon-14 And more of these kind of atoms are isotopes as they are the same atoms with different masses
Stable Isotopes
Stable isotopes never decay or are not very reactive
Example -: Carbon-12 And Oxygen - 16
Unstable Isotopes
Unstable isotopes are the isotopes that decay really quickly and are highly reactive
Examples - Carbon 14 Or Carbon 13