The atoms of noble elements are the most stable atoms due to the completeness of their outermost energy level with electrons, the atoms of other elements tend to enter in chemical reactions to reach...
The molecule is the building unit of matter, It is the smallest part of matter which can exist freely & it has the properties of matter, Matter in any state (solid, liquid or gaseous)...
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.
