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.
Multiple system atrophy (MSA), also known as Shy-Drager syndrome, is a rare neurodegenerative disorder characterized by tremors, slow movement, muscle rigidity, and postural instability balance difficulties (collectively known as parkinsonism) due to dysfunction of the autonomic nervous system, and ataxia.