Lanthanides and actinides Lanthanides and actinides are located below the modern periodic table, They consist of two rows, They are known as the f-block elements because they have valence electrons in the f-shell, Lanthanides...
The inert gases are the elements in which the outermost electron shells are completely filled with the electrons, so they don’t participate in any chemical combination in the ordinary conditions.
The covalent bond The covalent bond is a bond occurred among the atoms of nonmetals through the participation of each atom with the same number of electrons to complete the outer electron shell.
The joint The joint is the location at which the bones meet each other, and they allow the movement between the bones, It is the point where two bones meet, The joints hold the...
