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.
Ecstasy is a drug that appeals to a young crowd and is popular in the late night dance bars the fact that it increases energy and allows its users to access seemingly unlimited energy. Signs that someone may be using ecstasy may include changes in their behavior, in their mood, even in the clothes they wear.