**3. Chemistry background**

It is helpful to identify some general features of a reaction and then study the related topics. Some of the most important of these are [19]:


destabilizing interactions that depend on the relative orientations of electrons (bonding or non-bonding) in space.

• Solvent Effects: Most reactions are conducted in solution, not in a gaseous state. The solvent selected for a given reaction may exert a strong influence on its course. Remember, solvents are chemicals, and most undergo chemical reaction under the right conditions.

Next, the basic concepts will be explained with radiochemistry examples.
