The role of the muscles in performing the movement
The muscular system The muscular system is the engine that moves our body, where the muscles generate the mechanical energy and the movement to the body due to the ability of the muscular cells...
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The lanthanides and actinides in the modern periodic table
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 properties of the noble (inert) gases
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.
What are the types of covalent bonds?
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.