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...
Alkali metals are elements that are not found in nature in a free state, but rather in the form of ionic compounds because these metals easily lose their valence electron and they are the...
Some of representative elements groups are known as regular groups, Because their elements show a great regularity & graduation in their properties and that is not found in the transition elements, One of the...
The coordinate bond is considered as a special type of the covalent bonds which differs only in the origin of the electron pair which is shared between the atoms involved in the covalent bond,...
The most stable atoms are those of noble gases such as helium , neon , argon …..etc , Because their outermost energy level is completely filled with electrons , so , the atoms of...
At the beginning of the nineteenth century Berzelius was the first scientist who classified elements into two main group ( metals and nonmetals ) , according to their physical properties , Indeed that was...
