Electronics play a key role in our life to transfer the information, entertainment, culture and also in war and in medicine to diagnose, prognosis or surgeries, Materials are classified according to their electrical conductivity...
Any metal contains positive ions & free electrons which can move around inside the metal but can not leave it due to the attractive forces of the surface which may be represented by a...
At the beginning of the nineteenth century, Berzelius was the first scientist who classified elements into two main groups (metals and nonmetals), according to their physical properties, Indeed that was before knowing anything about...
The element is composed of the molecules, Each molecule consists of the atoms, the atom is electrically neutral in its ordinary state (In the atom, the number of the electrons equals the number of...
