Another possibility is that only a portion of one molecule is transferred to the other molecule. This type of reaction occurs, for example, in redox and acid-base reactions. In redox reactions, the transferred particle is an electron, whereas in acid-base reactions it is a proton.
Psychology is the study of mind and behavior. It is an academic discipline and an applied science which seeks to understand individuals and groups by establishing general principles and researching specific cases.
Psychology is the study of human thought, emotion and behavior. Someone who is trained in this discipline is called a psychologist and he or she has a variety of options from which to choose when deciding on an area of specialization. The most popular areas are clinical, counseling and school psychology.