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Imagine two types of the same atom, both having the same number of protons, which is their atomic number, yet they have different numbers of neutrons. This is the essence of isotopes. Because the number of protons determines the element, isotopes belong to the same element but differ in mass. For example, Carbon-12 and Carbon-14 are both isotopes of Carbon, but they have different masses due to differences in neutron numbers.
These differing neutron counts do not alter the chemical properties considerably, which means all isotopes of a particular element generally behave the same way in chemical reactions. However, the difference in mass can lead to differences in physical properties such as density or the rate of nuclear decay for radioactive isotopes.

Radioactivity is an intriguing property that some isotopes exhibit. It involves the spontaneous decay of an unstable nucleus, releasing energy in the form of radiation. This decay process is unique to specific isotopes and can include alpha particles, beta particles, or gamma rays. Such isotopes are referred to as radioactive isotopes.
Radioactivity is a natural event, and it can be utilized effectively in various scientific fields. One vital application is the creation of radiotracers, which harness the emitted radiation to track movement and interaction in chemical processes, without interfering with the reaction itself. For instance, a radiotracer incorporated in a molecule will emit detectable signals, allowing for precise observation of its path and behavior during a chemical reaction.

Chemical reactions are the processes whereby substances change into new substances. This involves the breaking of old bonds and the formation of new ones. When radiotracers, which are often composed of radioactive isotopes, are introduced into these reactions, they play a pivotal role as tracers that can reveal crucial insights about the reaction pathways without altering the reactions themselves.
Radiotracers help scientists, for example, by allowing them to observe reaction intermediates, evaluate the efficiency of certain reaction steps, and even trace metabolic pathways in living organisms. As such, radiotracers serve as invisible laborers that illuminate the path of chemical transformations, providing a deeper understanding of complex processes that occur at the molecular level.