For example, 63 Cu (29 protons and 34 neutrons) has a mass number of 63 and an isotopic mass in its nuclear ground state is 62.91367 u. There are two reasons for the difference between mass number and isotopic mass, known as the mass defect:
The Electra complex is an ambiguous psychiatric concept which attempts to explain the maturation of the human female. It is said to be the female counterpart to the Oedipus complex in males.
Sister complex is part of the lexicon of current pop culture, and is not a diagnosable mental illness. A complex, in general, refers to an unconscious constellation of psychological and emotional factors that influence a person's feelings and behavior. In psychoanalytic theory, a complex was a feature of neurosis, a mild mental disorder that caused anxiety and distress, but not psychotic symptoms.