What are isotope how do isotopes of atom differ?

Isotopes are variants of a chemical element that have the same number of protons but different numbers of neutrons in their nuclei. This difference in neutron count results in variations in Atomic Mass, though the chemical properties of isotopes are largely similar. For example, carbon-12 and carbon-14 are isotopes of carbon, with carbon-12 having six neutrons and carbon-14 having eight. Isotopes can be stable or radioactive, with the latter undergoing decay over time.